Question

A= ( x + 3 )^2 + ( x -3 ) ( x + 3 ) - 2 ( x + 2 ) ( x - 4 ) X = -1/2

Answer 1

\(A=\left(x+3\right)^2+\left(x-3\right)\left(x+3\right)-2\left(x+2\right)\left(x-4\right)\)

\(=x^2+6x+9+x^2-9-2\left(x^2-2x-8\right)\)

\(=10x+16\)

\(=10\left(-\dfrac{1}{2}\right)+16=11\)

 

Answer 2

\(A=\left(x+3\right)^2+\left(x-3\right)\left(x+3\right)+2\left(x+2\right)\left(x-4\right)\)

\(=x^2+6x+9+x^2-9-2\left(x^2-2x-8\right)\)

\(=2x^2+6x-2x^2+4x+16\)

\(=10x+16=5+16=21\)