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)

Answer 1

Any ideas?

Answer 2

OpenStudy values the Learning process - not the ‘Give you an answer’ process
Don’t post only answers - guide the asker to a solution.

Answer 3

nope

Answer 4

Try FOIL

Answer 5

Ok first off you check if the x^2 has something in front of it if it does multiply it by 30, here the equation if you don't understand the values:
ax^2 + bx + c

Answer 6

This one doesn't have anything in front exept a 1 so just leave it like it is, next find all the factors of "c" in this case -30

Answer 7

1 * -30
2 * -15
3 * -10
5 * -6
since its negative you have to do extra work and flip the negatives to the other side:

-1 * 30
-2 * 15
-3 * 10
-5 * 6

Answer 8

Now you find the pair that ADDS up to "b" or -7

Answer 9

i still didnt get it

Answer 10

Well another thing you can do is what skullpatrol said try foil

Answer 11

which is basicly distributing thirst pair of parenthesis to the second pair

Answer 12

the first*

Answer 13

so if you think its the first one you do this:
(x − 10)(x + 3)
x * x, x * 3, -10 * x, -10 * 3