Question

Giải bài 2.4 trang 33

`a,x^2 + 4x + 4`

`b,16a^{2} - 16ab + 4b^{2}`

Answer 1

`a,x^2 + 4x + 4`

`=x^2 + 2 . x . 2 + 2^2`

`=(x+2)^2`

`b,16a^{2} - 16ab + 4b^{2}`

`=(4a)^{2} - 2 . 4a . 2b + (2b)^{2}`

`=(4a-2b)^{2}`

Answer 2

a)\(x^2+4x+4\)

\(=x^2+2\cdot x\cdot2+2^2\)

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

b) \(16a^2-16ab+4b^2\)

\(=\left(4a\right)^2-2\cdot4a\cdot2b+\left(2b\right)^2\)

\(=\left(4a-2b\right)^2\)