Evaluate
\[ (2x + y)(2x – y) \]
Solution:
Using identity:
\[ (a+b)(a-b)=a^2-b^2 \]
\[ (2x + y)(2x – y) \]
\[ = (2x)^2 – y^2 \]
\[ = 4x^2 – y^2 \]
\[ (2x + y)(2x – y) \]
Using identity:
\[ (a+b)(a-b)=a^2-b^2 \]
\[ (2x + y)(2x – y) \]
\[ = (2x)^2 – y^2 \]
\[ = 4x^2 – y^2 \]