Question

Factorise 84-2r-2 r square

Answer 1

Step-by-step explanation:

-2r^2-2r-84=0

-2(r^2+r+42)=0

r^2+r+42=0

r^2+6r+7r+42=0

r(r+6)+7(r+6)=0

(r+6)(r+7)=0

r=-6,-7 ans..

Answer 2

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