Question

Rút gọn biểu thức: (2 + x)(x - 5) - (x + 2)(x - 2)

Answer 1

(2 + x)(x - 5) - (x + 2)(x - 2)
= ( x + 2 )(x - 5 - x + 2 )
= ( x + 2 ) (-3)
-3x - 6 

Answer 2

\(\left(2+x\right)\left(x-5\right)-\left(x+2\right)\left(x-2\right).\)

\(=\left(x+2\right)\left(x-5-x+2\right).\)

\(=\left(x+2\right)\left(-3\right).\)

\(=-3x-6.\)