Question

rút gọn (5x-1)^2+2(5x-1)(5x+1)+5(2x-1)

Answer 1

(5x-1)^2+2(5x-1)(5x+1)+5(2x-1)

=25x^2-10x+1+2(25x^2-1)+10x-5

=25x^2-4+50x^2-2

=75x^2-6

Answer 2

\(\left(5x-1\right)^2+2\left(5x-1\right)\left(5x+1\right)+5\left(2x-1\right)\)

\(=25x^2-10x+1+2\left(25x^2-1\right)+10x-5\)

\(=25x^2-10x+1+50x^2-2+10x-5\)

\(=\left(25x^2+50x^2\right)+\left(10x-10x\right)+\left(1-2-5\right)\)

\(=75x^2-6\)