Question
\((2x+7)(2x-7)\)
Solution
1
\(\text{Compare the expression }(2 x + 7)(2 x - 7) \text{ with } (a+b)(a-b) \text{ and find the value of } a \text{ and } b.\)
\(a=2 x; \space b=7\)
2
\(\text{Use an identity }(a+b)(a-b)=a^2-b^2 \text{ to expand the given expression.}\)
\(4 x^{2} - 49\)
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