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$$\dfrac{3}{x^2}-4x^3$$   

There is not expansion here and no constant.  You had best check the question.

i was acting like my math teacher

use gogle

According to the law of the Medes and Persians, offences against Royalty are not pardonable. Neither can the law be changed.

The law requireth a unicorn be painted upon the nail of each finger which committed the offence.

When by order of nobility and request of commoner, the unicorns must dance until the moon returneth to its present phase.

So it is written. So shall it be done.

ninjadevo i think ur wrong?

To divide two fractions, you have to multiply by the reciprocal (in other words, flip-flop the second fraction)

Here's an example: 

1/2 ÷ 2/6 = 1/2 * 6/2 = 6/4

so your answer would be 6/4, or 1.5

Ah, I see.

It should be - (-90), or + (+90)

Sorry about that, but thanks for the correction.

Yours looks right.

I think i'll give him thumbs-up for a good attempt !!!....those minus signs are tricky !!

Heck...I hope I got it right !!

$$2\times \pi\times 9=18\pi$$

Hi NinjaDevo,

You have just messed up with your minus signs.  that's all.  You always have to be very careful with those.  They  are nasty little creatures!

(.6ab - .5bc + cd) - ( - .5ab + 2.5bc - cd)    ........distribute the negative across the terms inside the second set of parenthesis

.6ab - .5bc + cd  + .5ab - 2.5bc + cd        .....combine like terms....

1.1ab - 3bc + 2cd

4cmx4cmx5cm=

(16 * 5)  cm ³ =

80 cm ³

(1 - √10 )² =

(1 - √10 ) (1 - √10 ) =

1 -1√10 - 1√10 + √10 * √10  =

1 - 2√10 + 10  =

11 - 2√10

Only if  n = 1

Tan K = 2.592

Use the tangent inverse to find this

atan(2.592) = 68.9°  .......note that this could also be a 68.9° angle in the third quadrant = 248.9°  

There's an easy way to always compare two fractions

1.1 / 9.5   = 1 /20       

Multiply the denominator of the second fraction  by the numerator of the first fraction and put this number  on the "left" 

Then, multiply the denominator of the first fraction times the numerator of the second fraction and put this on the "right"

So we have

(20)*(1.1)        (9.5)*(1)   

22                      9.5  

Which side is larger ??     Then, that's the side that was greater in the first place !!

So

1.1 / 9.5   >   1 /20   

(3x²y) - (2xy²) + (10xy) - (15y) for x= -5, y=3

(3(-5)²(3)) - (2(-5)(3)²) + (10(-5)(3)) - (15(3)) =

9*25   + 90   - 150 - 45   =

225 -150  + 45   = 

75 + 45  = 

120

1 minute = 60 sec   .....so.....

.0049  / 60    =  (x)  / 1        ......cross multipying, we have....

.0049 = 60 (x)           ........divide by 60  on both sides

.0049/60 =  x   ≈    .00008166 Paise

Let's let "n" be the number tht we're looking for.....so we have....

34 × 45 = (34 × 40) + (n × 5)      .....        simplifying, we have

1530 = 1360 + (n X 5)                  ......       subtract 1360 from both sides

170 = (n X 5 )                               .......      divide both sides by 5

34   =  n 

And that's the number we're looking for.....

This is a linear equation.....I can substitute any real value in for "n" (the domain) and get back any real number (the range).

So, rhe domain and range is just (∞, ∞)

I like to separate these into parentheses to make it easier to solve

(3x²y) - (2xy²) + (10xy) - (15y) for x= -5, y=3

(3[-5]²[3]) - (2[-5][3]²) + (10[-5][3]) - (15[3])

(3[25][3]) - (2[-5][9]) + ([-50][3]) - (15[3])

(225) - (90) + (-150) - (45)

(135) + (-195) = 60

So, if I did everything correctly, the answer is 60.

|5|² = ?

The "|"s mean that if there is a negative number in them make them positive, and if there is a positive number, leave them positive.

So |5|² = (5)² = 25

25 is the answer

-4b-2/4a-3a-1/5b-3= ?

(-4b)-(2/4a)-(3a)-(1/5b)-3 = ?

(-4(5))-(.5(4))-(3(4))-(.2(5))-3 = ?

(-20)-(2)-(12)-(1)-3 = -38

-38 is the answer.