Question

2x^2-3x-15=5 2x^2-3x-15=5 @Mathematics

Answer 1

2x^2-3x-15=5


2x^2-3x-15-5=0


2x^2-3x-20=0


2x^2-8x+5x-20=0


2x(x-4)+5(x-4)=0


(2x+5)(x-4)=0


2x+5=0 or x-4=0


2x=-5 or x=4


x=-5/2 or x=4

Answer 2

Are you the guy that helped me last time?! :D

Answer 3

with history yeah

Answer 4

how did that go

Answer 5

Very good, thanks! I thought you helped me with math too.. hmm.

Answer 6

maybe...not sure, but you're probably right

Answer 7

Are you a teacher or student or..?

Answer 8

student learning to become a teacher so both in a way

Answer 9

Ah, so in college?

Answer 10

yep

Answer 11

x^2+2x-1=2

x^2+2x-3=0

Not sure where to go from there

Answer 12

find two numbers that BOTH

a) multiply to -3

AND

b) add to 2


These two numbers are 3 and -1


So we break up 2x into 3x-1x to get


x^2+2x-3=0


x^2+3x-1x-3=0


x(x+3)-1(x+3)=0


(x-1)(x+3)=0


I'll let you take over from here