Question

help pls this question has to be No answer right?

Answer 1

\[x^2-9x-136\]

Answer 2

what are you trying to do exactly? Solve for x or factor? or something else?

Answer 3

Factor the trinomial.

Answer 4

Let's compute the discriminant

D = b^2 - 4ac
D = (-9)^2 - 4(1)(-136)
D = 81 + 544
D = 625


Notice how the discriminant D = 625 is a perfect square

25^2 = 25*25 = 625 or put another way sqrt(625) = 25

So this implies that we can factor

Answer 5

If the discriminant wasn't a perfect square, then you wouldn't be able to factor

Answer 6

you need to find two numbers that

A) multiply to -136
and
B) add to -9

Answer 7

all i think about it 9 x1 and 3 x 3

Answer 8

what are some ways to multiply to -136?

Answer 9

8 and 17

Answer 10

one of them has to be negative

Answer 11

-17 & 8

Answer 12

yes so that means x^2-9x-136 factors to (x-17)(x+8)

Answer 13

thank you !

Answer 14

you're welcome