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Question
Evaluate : `(3"x"-1/(2"y"))(3"x"+1/(2"y"))`
Sum
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Solution
`(3"x"-1/(2"y"))(3"x"+1/(2"y"))`
`=3"x"(3"x"+1/(2"y"))-1/(2"y")(3"x"+1/(2"y"))`
`=9"x"^2+(3"x")/(2"y")-(3"x")/(2"y")-1/(4"y"^2)`
`=9"x"^2-1/(4"y"^2)`
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Product of Sum and Difference of Two Terms
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