Question

what multiplies to 2x^2 and adds to -1x?

Answer 1

im factoring, the problem is 2x^2 -x-1

Answer 2

multiply first and last coefficients: 2*(-1) = -2

find two numbers that multiply to -2 AND add to -1 (the middle term)

these two numbers are -2 and 1

since -2*1 = -2 and -2+1 = -1

Answer 3

so this means


2x^2-x-1


2x^2+x-2x-1


(2x^2+x)+(-2x-1)


x(2x+1)+(-2x-1)


x(2x+1)-1(2x+1)


I'll let you finish

Answer 4

sweeet! thank you!

Answer 5

tell me what you get

Answer 6

yw

Answer 7

(x-1) (2x+1)

Answer 8

you got it

Answer 9

yea, im tired couldnt think of the numbers tonight. thank you!

Answer 10

sure thing