Q14 of 90 Page 115

8x3 - 2x = ?

8x3 - 2x


Using the identity: a2 - b2 = (a + b)(a - b)


8 x3 - 2x


= 2x(4 x2 - 1)


= 2x(2x - 1)(2x - 1)

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12

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10p2 + 11p + 3 = ?

 15

gives

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Fill in the blanks.

(i) x2 - 18 x + 81 = (…)


(ii) 4 - 36x2 = (…)(...)


(iii)x2 - 14x + 13 = (…)(…)


(iv) 9z2 - x2 - 4y2 + 4xy = (…)(…)


(v) abc - ab - c + 1 = (…)(…)