1
Question
Factorise:
7y2−19y−6
Factorise:
7y2−19y−6
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Solution
7y2−19y−6=7y2−21y+2y−6 ⎧⎪⎨⎪⎩∵7×(−6)=−42∴−42=−21×2−19=−21+2⎫⎪⎬⎪⎭=7y(y−3)+2(y−3)=(y−3)(7y+2)
7y2−19y−6=7y2−21y+2y−6 ⎧⎪⎨⎪⎩∵7×(−6)=−42∴−42=−21×2−19=−21+2⎫⎪⎬⎪⎭=7y(y−3)+2(y−3)=(y−3)(7y+2)
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