Question

multiply x²+7x-8 by -2y​

Answer 1

-2yx²-14xy+16y

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Answer 2

Answer:

Step-1 : Multiply the coefficient of the first term by the constant 1 • -8 = -8

Step-2 : Find two factors of -8 whose sum equals the coefficient of the middle term, which is -7 .

-8 + 1 = -7 That's it

Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above, -8 and 1

x2 - 8x + 1x - 8

Step-4 : Add up the first 2 terms, pulling out like factors :

x • (x-8)

Add up the last 2 terms, pulling out common factors :

1 • (x-8)

Step-5 : Add up the four terms of step 4 :

(x+1) • (x-8)

Which is the desired factorization