Question

Using identity a? - b2 = (a + b)(a - b) find the product -
(i) (2a + 7) (2a – 7)
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Answer 1

$\huge {\textbf {\underline {\underline {ANSWER }}}}$

( 2a + 7 )( 2a - 7 )

= ( 2a )^2 - ( 7 )^2

= 4a^2 - 49

Answer 2

the product of the question is according to the question as we have given 2 + 7 into 2-7=[2] square - [7] square as we are also use the identity of a minus b into a + b then we get a square minus b square