\(\left(5x^2-2x\right)^2+2x-5x^2-6=25x^4-2.5x^2.2x+4x^2+2x-5x^2-6.\)
\(=25x^4-20x^3-x^2+2x-6\)
\(=25x^4-25x^3+5x^3-5x^2+4x^2-4x+6x-6.\)
\(=\left(25x^4-25x^3\right)+\left(5x^3-5x^2\right)+\left(4x^2-4x\right)+\left(6x-6\right).\)
\(=25x^3\left(x-1\right)+5x^2\left(x-1\right)+4x\left(x-1\right)+6\left(x-1\right).\)
\(=\left(x-1\right)\left(25x^3+5x^2+4x+6\right)\)
\(=\left(x-1\right)\left[25x^3+15x^2-10x^2-6x+10x+6\right]\)
\(=\left(x-1\right)\left[5x^2\left(5x+3\right)-2x\left(5x+3\right)+2\left(5x+3\right)\right]\)
\(=\left(x-1\right)\left(5x+3\right)\left(5x^2-2x+2\right)\)
Câu hỏi của Thu Thanh - Toán lớp 8 - Học toán với OnlineMath
