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प्रश्न
Evaluate: `(4/7"a"+3/4"b")(4/7"a"-3/4"b")`
उत्तर
`(4/7"a"+3/4"b")(4/7"a"-3/4"b")`
`=(4/7"a")^2-(3/4"b")^2` ......[ ∵ (a − b) (a + b) = a2b2]
`=16/49"a"^2-9/16"b"^2`
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