Question

(x-5)(x+5) - ( x + 3 )( x-3)

Answer 1

`(x-5)(x+5) -(x+3)(x-3)`

`= x^2 -25 - ( x^2 -9)`

`= x^2 -25 -x^2 +9`

`= -16`

Answer 2

\(\left(x-5\right)\left(x+5\right)-\left(x+3\right)\left(x-3\right)\)

\(=x^2+5x-5x-25-x^2+3x-3x+9\)

\(=\left(x^2-x^2\right)+\left(5x-5x\right)+\left(3x-3x\right)+\left(-25+9\right)\)

\(=0+0+0-16\)

\(=-16\)