Question

Simplify: (2x-7)(2x+7)

Answer 1

First, we multiply both expressions:

`(2x-7)(2x-7)=2x\cdot2x-7\cdot2x-2x\cdot7+7\cdot7.`

Now, we simplify:

`\begin{gathered} 2x\cdot2x-7\cdot2x-2x\cdot7+7\cdot7=4x^2-2(7\cdot2x)+49 \\ =4x^2-28x+49. \end{gathered}`

Answer:

`4x^2-28x+49.`