What are the factors of x2 − 7x − 30?

(x − 10)(x + 3)

(x + 10)(x − 3)

(x + 15)(x − 2)

(x − 15)(x + 2)

Question

What are the factors of x2 − 7x − 30?

 (x − 10)(x + 3)

 (x + 10)(x − 3)

 (x + 15)(x − 2)

 (x − 15)(x + 2)

anonymous · Answer

@jigglypuff314

jigglypuff314 · Answer

numbers that multiply to 30 and add up to -7

anonymous · Answer

I'm stuck on this one :/

jigglypuff314 · Answer

x^2 − 7x − 30 it's just like the previous ones
         ^       ^   so should multiply to -30   and add to -7
can't be (x + 15)(x − 2) because
                    ^         ^     15+(-2) does not equal -7

anonymous · Answer

C!

anonymous · Answer

Or D.

jigglypuff314 · Answer

no... I just explained why... 15+(-2) does not equal -7
(x − 10)(x + 3)
       ^        ^    -10+3 = :)

anonymous · Answer

My bad haha. I'm not so good in math.

jigglypuff314 · Answer

It's okay, you'll get the hang of it with more practice :)

anonymous · Answer

Yeah thanks to you I got way better at it. I really appreciate all the help. :)