Question

thực hiện phép tính:

a, (2x + 1)² - 4x (x - 1)

b, (x - 2) (x + 2) - (x - 1)²

Answer 1

a. \(\left(2x+1\right)^2-4x\left(x-1\right)=4x^2+4x+1-4x^2+4x=8x+1\)

b. \(\left(x-2\right)\left(x+2\right)-\left(x-1\right)^2=x^2-4-x^2+2x-1=2x-5\)

Answer 2

a)\((2x+1)^2-4x(x-1)=4x^2+4x+1-4x^2+4x\)

=\(8x+ 1\)

b)\((X-2)(x+2)-(x-1)^2=X^2-4-(x^2-2x+1)\)

=\(X^2-4-x^2+2x-1=2x-5\)

Answer 3

a: \(\left(2x+1\right)^2-4x\left(x-1\right)\)

\(=4x^2+4x+1-4x^2+4x\)

=8x+1

b: \(\left(x-2\right)\left(x+2\right)-\left(x-1\right)^2\)

\(=x^2-4-x^2+2x-1\)

=2x-5