Question

a) (2x^2-x-1) (3x-2) + (x-3) (5-6x^2)

b) (x+1) (x^2-x+1) - (x-1) (x^2+x+1) - x^2

c) (2x-1)^2 + (2x+5)^2 - 2 (2x+5) (2x-1)

Answer 1

a: \(=6x^3-4x^2-3x^2+2x-3x+2+5x-6x^3-15+18x^2\)

\(=11x^2+6x-13\)

b: \(=x^3+1-x^3+1-x^2=2-x^2\)

c: \(=\left(2x+1-2x-5\right)^2=\left(-4\right)^2=16\)