1
Question
Factorise :84−2r−2r2
Factorise :84−2r−2r2
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Solution
The correct option is A 2(7+r)(6−r)
84−2r−2r2
=2(42−r−r2)
=−2(r2+r−42)
=−2(r2+7r−6r−42)
=−2(r(r+7)−6(r+7))
=−2(r+7)(r−6)
=2(r+7)(6−r)
84−2r−2r2
=2(42−r−r2)
=−2(r2+r−42)
=−2(r2+7r−6r−42)
=−2(r(r+7)−6(r+7))
=−2(r+7)(r−6)
=2(r+7)(6−r)
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