Factorise y2 + 7y – 18

(i) x² + 6x – 7

(ii) y² + 7y – 18

Answer :

(i)  x² + 6x – 7

x² + 7x – x – 7

Take out common in all terms we get,

x(x + 7) – 1(x + 7)

(x + 7) (x – 1)

(ii) y² + 7y – 18

y² + 7y – 18

y² + 9y – 2y – 18

Take out common in all terms we get,

y(y + 9) – 2(y + 9)

(y + 9) (y – 2)

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