(2x-7)(2x+5)(x^2-9)=91
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13×7×1×1 =91
(2x-7)(2x+5)(x+3)(x-3) =91
put x=4
(2×4-7)(2×4+5)(4+3)(4-3)
= ( 1)(13)(7)(1) = 91
x= 4
for the fast calculation you must try hit and trial method ....
(2x-7)(2x+5)(x+3)(x-3) =91
put x=4
(2×4-7)(2×4+5)(4+3)(4-3)
= ( 1)(13)(7)(1) = 91
x= 4
for the fast calculation you must try hit and trial method ....
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