9y?+21yz -8y?
hey, cansomebody help me? we've to factorize.

so y(9y+21z4-8y)

Step-by-step explanation:

they all have a common factor of y

so put it before the bracket y()

we can see no other common factor

so you divide each number by y

BTW: im answering the question on the picture not the question on the title

answer: 1 and 3

step-by-step explanation:

option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.