Question

x^2-20+36

Answer 1

x^2-20+36 =0? is it equal to 0?
x^2 + 16 = 0
x^2 = -16
x = -4 or 4

Answer 2

I have to factor it and I don't know how

Answer 3

Factoring is no fun but once you get the hang of it it becomes easy... so you may have to consult this website first http://www.instructables.com/id/How-to-factor/ or i can walk you through this problem

Answer 4

4 and -4 are the factors
x = √-16
x = -4 and 4

Answer 5

Are you sure it isn't x^2 - 20x + 36

Answer 6

o im sorry it is x^2-20x+36 im sorry

Answer 7

Well, if that's the case then find two numbers, a and b, that add to get -20, yet multiply to get +36:

a + b = -20
ab = 36

Answer 8

18 + 2 and 18 * 2

Answer 9

-18 - 2 to be more precise. But great job.

Answer 10

Now, since -20 = -18 - 2, we can replace that in the expression:

x^2 - 20x + 36
x^2 -(18 + 2)x -18*-2
x^2 -18x - 2x -18*-2

Now factor x from the first two terms; Factor -2 from the last two terms:

x(x - 18) -2(x - 18)

Finally factor (x - 18) out of the expression to get:
(x - 18)(x - 2)

Answer 11

Just correcting some errors. -18*-2 = 36

Answer 12

This method is factor by grouping. There's less guessing involved if you do it this way.

Answer 13

ok i see how you did that thanks

Answer 14

Okay good.