Question

cứu

Answer 1

\(a,=x^2+4x+4\\ -----\\ b,=x^2+8x+16\\ -----\\ c,=x^2-6x+9\\ -----\\ d,=x^2-10x+25\\ -----\\ e,=4x^2-20x+25\\ -----\\ f,Sửa:\left(3-2x\right)^2=9-12x+4x^2\\ -----\\ g,=x^2-9\\ -----\\ h,=x^2-16\\ -----\\ m,=4x^2-1\\ -----\\ n,=x^2-1\\ -----\\ k,=x^2-25\\ -----\\ j,=x^2-\dfrac{1}{4}\\ \)

ADHĐT : \(\left(a+b\right)^2=a^2+2ab+b^2\\ \left(a-b\right)^2=a^2-2ab+b^2\\ a^2-b^2=\left(a-b\right)\left(a+b\right)\)