Question

tính ( rút gọn)

 (x-10)^2 - 2(x-10)(5x-3)+(5x-3)^2

 

Answer 1

\(\left(x-10\right)^2-2\left(x-10\right)\left(5x-3\right)+\left(5x-3\right)^2\)

\(=\left(x-10-5x+3\right)^2=\left(-4x-7\right)^2=\left(4x+7\right)^2\)

\(=16x^2+56x+49\)

Answer 2

Ta có: \(\left(x-10\right)^2-2\left(x-10\right)\left(5x-3\right)+\left(5x-3\right)^2\)

\(=\left(x-10-5x+3\right)^2\)

\(=\left(-4x+6\right)^2\)

\(=16x^2-48x+36\)