Factorise y2+3y-28
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y² + 3y - 28 = 0
y² + 7y - 4y - 28 = 0
y (y - 4) -4 (y - 4) = 0
(y - 4) (y - 4) = 0
y = 4 or y = 4
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Step-by-step explanation:
y^2+3y-28
=y^2+(7-4)y-28
=y^2+7y-4y-28
=y[y+7]-4[y+7]
=(y+7)(y-4)
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