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Factorise: y^2 + y – 72

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Factorise: y2 + y – 72

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First find the two numbers whose sum= 1 and product= -72

Clearly, the numbers are 9 and 9

∴ we get, y2 + y – 72 

= y2 + 9y – 9y – 72

= y(y+9) – 9(y+9)

= (y+9) (y-9)

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