Question

Giúp em hai câu này vs ah

Answer 1

b: \(=4\left[4-\left(x+1\right)^2\right]\)

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

\(=4\left(1-x\right)\left(3+x\right)\)

d: \(=4x^4+4x^2+1-4x^2\)

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

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

Answer 2

`b, =4(4 - (x+1)^2)`

`= 4(3-x)(5+x)`

`c, 4x^4 + 1`

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

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

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