Question

Answer 1

Bài 1:

\(1,\\ a,=4x^5-12x^4+8x^3\\ b,=\left(7x+4\right)\left(7x+4-7x+4\right)=8\left(7x+4\right)=56x+32\\ 2,A=\left(3x+2-2x+7\right)^2=\left(x+9\right)^2\\ A=\left(-19+9\right)^2=\left(-10\right)^2=100\)

Bài 2:

\(a,=3x\left(2x-5\right)\\ b,=x\left(x-y\right)+5\left(x-y\right)=\left(x+5\right)\left(x-y\right)\\ c,=x^2-3x-5x+15=\left(x-3\right)\left(x-5\right)\)