(i) (2x + 5)^2 - (2x - 5)^2
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shi7
shi7
18.10.2017
Math
Secondary School
+5 pts
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Simplify. (2x+5)square -(2x-5)square?
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NIRANJAN45
NIRANJAN45
(2x+5) ^2-(2x-5) ^2
by using identity
a^2-b^2=(a-b) (a+b)
here
a=(2x+5)
b=(2x-5)
so
(2x+5) ^2-(2x-5) ^2=[2x+5-(2x-5) ][2x+5+2x-5]
=10×4x
=40x
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20 is the answer
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