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Question
Factorise the following expression.
`9"x"^2-1/16"y"^2`
Solution
`9"x"^2-1/16"y"^2`
= `(3"x")^2-(1/4"y")^2`
= `(3"x"+1/4"y")(3"x"-1/4"y")` ....[∵ a2 − b2 = (a + b) (a − b)]
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