84 – 2r – 2r2= – 2(r2 + r – 42)= – 2 (r2 + 7r – 6r – 42)= – 2 {r(r + 7) – 6(r +7)}

Q. 23 D4.5( 11 Votes )

Factorise:
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Answer :

84 – 2r – 2r²

= – 2(r² + r – 42)

= – 2 (r² + 7r – 6r – 42)

= – 2 {r(r + 7) – 6(r +7)}

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