Question

1, tính
a (x^2-3x+1)(-2x-5)
b (3x^4-8x^3-10x^2+8x-5).(3x^2-2x+1)

c 12x^5y+24x^2y^2-36x^3y^2

d 4x^2-3x-6y+8xy
e x^2 -5x+4

Answer 1

a: \(=-2x^3+5x^2+6x^2+15x-2x-5\)

\(=-2x^3+11x^2+13x-5\)

c: \(=12x^2y^2\left(x^3+2-3x\right)\)

e: =(x-1)(x-4)

d: \(=x\left(4x-3\right)+2y\left(4x-3\right)=\left(4x-3\right)\left(x+2y\right)\)