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= 26.6 according to google.

((-3/) /(x² - 9)) + ((5) / (4x + 12))    factor, where possible

(-3)/[(x + 3)(x - 3)] + (5)/[4(x + 3)]  get common denominators

[(-3)(4) + (5)(x - 3)]  / [(4)(x -3)(x + 3)]   simplify

[-12 + 5x - 15] /[4(x -3)(x + 3)] =

[5x - 27] / [4(x -3)(x + 3)]

He put it into the site calculator.

But it is so huge that the calc cannot display the answer.

So it has called it infinity.  It isn't really infinity it is just huge beyond our imagination.

Maybe i am wrong but this question doesn't make sense to me.

c and n are numbers, they don't phase me, but where did y suddenly appear from?

Are you sure there is not something missing or changed from the original question?

= 3.94020062e115 is what google says

The gradient of y=2x+3    is   2

This is the same question asked in a different way.

$$\frac{d}{dx}\;(2x+3)=2$$

Thanks a lot CPhill!

Although this calculator says "infinity", you can get a better answer by using logs.

Let  x  =  7²⁰¹⁵

Then  log(x)  =  log(7²⁰¹⁵)

--->   log(x)  =  2015·log(7)

--->   log(x)  =  1702.87   (approx)

--->   x  =  10^1702.87

Since 10^.87 is approximately 7, 

the value is a 7 followed by 1702 zeros (approximately).

Not infinity.......just REALLY big  !!!

5+2(x-1)=12   subtract 5 from both sides

2(x - 1)  = 7   divide both sides by 2

x - 1  = 7/2     add 1 to both sides

x = 7/2 + 1   = 7/2 + 2/2  = 9/2

"rad" is "radians"

"deg" is "degrees"

In a circle, there are 360 degrees and 2π radians.

A proportion  that relates these two is:  radians/π  =  degrees/180

= 12805. Its the same way you would use a normal calculator silly

[x^2 - 4x - 5] / [x^2 - 2x - 3]  * [2x^2 - 7x + 3] / [x^2 -25]

Factor everything

[(x -5)(x+ 1)] / [ (x -3)(x+1)] * [(2x -1)(x -3)] / [(x + 5)(x -5)] =

(x-5)/(x -3) * [(2x -1)(x-3)] /[ (x+5)(x-5)] =

(2x -1) / (x+5)

Thank you geno 3141

7 to the 2015 power is infinity

Notice that (x^2 +1)  can never equal 0

Count the number of times that 5 appears in the table and divide that number by 100, the number of times that the spinner was spun.

Ecperimental Probability  =  Number of Successes / Total Number of Trials.

CPhill

How come (1-3x^2) is the only thing that makes this zero?

This is a right triangle.

And the sine of (abc) = 5/√41

42 according to the hitchhikers guide to the galaxy.

pie is something you eat with ice cream. pi is 3.14159265359

You must mean pi. It is the ratio of the diameter of a circle to the circumference, usually accepted as 3.14159 or thereabouts.

See the drop down menu above under Formulary, Logarithms. They give some rules.

if y=x^2 + 2x - 3 and x= -3

So we have

y = (-3)^2 + 2(-3) - 3

y = 9 - 6 - 3  = 0