All Answers 358087 Answers

Can I have an explanation on how to do this question? x^2=2x+8

Anon: One minor correction. It's NOT simultaneous equation by QUADRATIC, or 2nd degree equation.

Dragonlance:

I was simply responding to the young person who didn't know how to use the calculator. After you instructed him/her on how to use it, then I realized that he/she had made a mistake!. But I had already written my comment before you straightened him/her out. I know nothing about the calculator. I use my own HP scientific calculator. I don't use any online calculators.

It's a simutaneous equation. If you solve it, it will give you the x coordinates of the intercepts between y = x^2 and y = 2x + 8.

To solve; put it all on one side, so it is equal to 0;

x^2 = 2x + 8

0 = x^2 - 2x - 8

then factorise and use null law to solve;

-4 and 2 multiple to -8, and add to -2

0 = (x-4)(x+2)

x = 4 and -2 so 4 and -2 are x coordinates of intercepts. To find full intercepts, sub these values into 1 of the original equations. Either will work, so just choice easiest:

y = x^2 , x = 4

y = (4)^2

y = 16, therefore (4,16) is intersection of graphs

y = x^2 , x = -2

y= (-2)^2

y = 4, therefore (-2, 4) is the other intersection

Can I have an explanation on how to do this question? x^2=2x+8,

Let's see x^2 - 2x=8

x^2 -2x -8=0, then you factor it as follows:

(x -4) * (x +2)=0, so that:

x=4 and x=-2

YOUR QUESTION IS NOT CLEAR. STATE IT CLEARLY SO THAT WE CAN HELP YOU.

2x+3+4x+2=11,

Put x part on one side and the numbers without x on the other side. Remember, when do that to change the sign + and -, when changing them around. Look carefully how I do it:

2x +4x=11 - 3 - 2

6x=6, so we divide both sides with 6 and we get:

6x/6=6/6

So x=1

There is no mistake

If you put this number in the calculator 

12345678901234567890

and click = then it displays

1.2345678901234568e19

at the top it look like this 1.2345678901234568 x 10¹⁹

Just use your brain to truncate (that means chop off if you not know) the part you not want.

Why is that a  mistake in the design?

I think it works good.

what's (2+1|2.71)2nd power 3/(5+3.14),

The first part of your question isn't clear. Do you mean ((2 + 1) 2.71)^2 ? Make clear, so that we can help you.

Then I would say that's a mistake in the design of the calculater & you should bring it to the attention of the people who designed that calculator, so that they can correct it. If I have a very big number such as 12345678901234567890, then if you want it displayed in scientific notation, then you start counting from the right until you get to the last digit or 1, which you don't include in your counting. If you did that you should get 19 digits. So now write that in scientific notation as follows: 1.2345678901234567890. Then we multiply this number by 10 raised to power of the number of digits you just counted, which was 19, so that we have this new number in scientific notation: 1.2345678901234567890 X 10^19. That's how scientific notation is written. Normally, you are asked to truncate the 1st. part to few digits between 2-10. Such as 1.23456 X 10^19. The last digit in the 1st. part is generally rounded off to 7, if  the number after it is 5 or bigger(which is 7 in this case), so that it becomes: 1.23457 X 10^19. And that's the end of this saga!!!!. Good luck. Hope you understand it now.

Your welcome.

HaHa, great.  Thanks!

1/3(3-2)+2/9(3)=1,

(1/3 x1) +6/9=1

1/3 +2/3=1

1=1 (TRUE!)

Just click the = key again then it will give scientific notation.

√(4x^2+25) then 2 x=5tanθ

Your question isn't clear as to you want,

If we take the sqrt of the 1st. part, then we have 2x +5,

Then you have 2x=5tan(Theta),

x=5tan(Theta)/2=2 1/2tan(Theta)

I don't see such a key on this on line calculator and it outputs very long numbers as if it doesn't use scientific notation.  I'm surprised, too.

what is 2+2*3.14/0?

That's a very good question!!

2 +6.28=8.28/0????????. That's a NO NO in Math!!!!. YOU CANNOT DIVIDE ANYTHING BY (0) BECAUSE THAT GIVES YOU INFINITY, WHICH IS A NASTY THING IN MATH!.

How many days is 23827172 minutes?

Or 45 1/3 years!!!. By then, you mighty be a Grand Dady or Grand Momy!!.

What is 9^(9^9)?

It's a very large number consisting of 369,693,100 digits long!!. If you were to write it down in a straight line with each digit 1 meter apart, it would go all the way from here to the moon(almost)!.

How to have calculator output in scientific notation?

Generally speaking, most calculators have a display of 10-12 digits.So, any number bigger than that will automatically be displayed by the caculator in scientific notation.Some of them have a "mode" key, asking you how you want the calculator to display, such as "normal", "scientific", "Fixed" to specific number of decimals, "Eng" for engineering display.....etc.

What is 8s value in 86974

I don't quite understand what you mean? Its value in this number is 80,000+6000+900+70+4=86,974

(a-3b)/(5.b) = (c-3*d)/(5c)

SORRY!! I meant: -1/2=-1 instead of -1/5=-1

If a/b=c/d then prove that

(a-3b)/(5.b) = (c-3*d)/(5c)

A very simple proof:let a=1, b=2, c=3, d=6 so that we have 1/2=3/6.Now substitute as follows: (1 - 3*2)/(5*2)=(3- 3*6)/(5*3)

We have(-5)/10=-15/15

Therfore -1/5 =-1 !!!!!!!!!!!!!!!!!!!!!!!! Where did get this gem from?

Total surface area = 6s².

If  s = 3/2,  then  area  =  6 x (3/2)²  =  6 x (9/4)  =  54/4  =  13.5  sq units.