use suitable identity and find the product ( 2x - 7 ) ( 2x -7 )
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It will be (2x-7)^2
Now (a-b)^2 =a^2 - 2ab + b^2 (Identity)
So here it will be
(2x)^2 - 2× 2x ×7 + (7)^2
=4x^2 - 28x + 49
Now (a-b)^2 =a^2 - 2ab + b^2 (Identity)
So here it will be
(2x)^2 - 2× 2x ×7 + (7)^2
=4x^2 - 28x + 49
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