Question

  rút gọn biểu thức giúp mình

Answer 1

a.

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

b.

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

\(=x^2+36\)

Answer 2

`a,` `(2x-1). (2x + 1) - 4x ^ 2 + 5`

`= (2x) ^ 2 - 1 - 4x ^ 2 + 5`

`= 4x ^ 2 - 1 - 4x ^ 2 + 5`

`= 4`

`b,` `(x+5)^ 2 -( 15(2x - 2) + 1`

`= x ^ 2 + 10x + 25 - 10x + 10 + 1`

`= x^2 + 36`