Factorise:
84 – 2r – 2r2
84 – 2r – 2r2
= – 2(r2 + r – 42)
= – 2 (r2 + 7r – 6r – 42)
= – 2 {r(r + 7) – 6(r +7)}
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Generated by AI. May contain inaccuracies — always verify with your textbook.