Question

What is the factored form of these expressions? I'm a little lost on how to do these
x^2+3x-18
and
3x^2+15x+1

Answer 1

x^2+3x-18
(x+6)(x-3)
and second you'd have to do with the quadratic formula i think

Answer 2

how did you get that? could you show me so i understand ?

Answer 3

Think of factors of -18 and pick the two factors whose sum is +3

Answer 4

for the first equation, all you have to do is ask the question: which 2 numbers, when multiplied, will give me -18 and those same 2 numbers, when added, will give me 3?
or, to all equations: which 2 numbers, when multiplied, will give me ac and those same 2 numbers, when added will give me the sum of b?

Answer 5

The second one is prime.

Answer 6

i understand the first one but not the second.

Answer 7

@dg98 @Mertsj

Answer 8

oh for the second, normal factoring will NOT work, so you're gonna have to use the quadratic formula, and you would get 2 answers because 1 square root actually has a pos an neg answer

Answer 9

Could you work through it with me?