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Question
Factorise xy2 - xz2, Hence, find the value of :
9 x 82 - 9 x 22
Solution
xy2 - xz2 = x(y2 - z2) = x(y - z)(y + z)
9 x 82 - 9 x 22
= 9 (82 - 22)
= 9(8 - 2)(8 + 2)
= 9 (6) (10) = 540
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