Bài 1:
\(\left(x+1\right)^2=x^2+2.x.1+1^2=x^2+2x+1\)
Bài 2:
\(\left(x-5\right)\left(x+5\right)=x^2-5^2=x^2-25\)
Bài 3:
\(\left(x-3\right)^3=x^3-3.x^2.3+3.x.3^2-3^3=x^3-9x^2+27x-27\)
Bài 4:
\(\left(4x+3\right)\left(16x^2-12x+3^2\right)\)
\(=\left(4x+3\right)\left[\left(4x\right)^2-4x.3+3^2\right]\)
\(=\left(4x\right)^3+3^3\)
\(=64x^3+27\).