Please solve quickly.
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not very sure........but hope you will get the trick
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(2x+5)^2-(2x-5)^2
a^2-b^2 =(a-b)(a+b)
(2x+5)^2-(2x-5)^2=[2x+5-(2x-5)][(2x+5+2x-5)]
=(2x+5-2x+5)(4x)
=10(4x)
=40x
a^2-b^2 =(a-b)(a+b)
(2x+5)^2-(2x-5)^2=[2x+5-(2x-5)][(2x+5+2x-5)]
=(2x+5-2x+5)(4x)
=10(4x)
=40x
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