Question

Answer 1

a: \(\left(x+1\right)\left(x^2+2x-1\right)-x^2\left(x+3\right)=4\)

=>\(x^3+2x^2-x+x^2+2x-1-x^3-3x^2=4\)

=>x-1=4

=>x=5

b: \(\left(x+1\right)\left(3x^2+x-2\right)-x^2\left(3x+4\right)=5\)

=>\(3x^3+x^2-2x+3x^2+x-2-3x^3-4x^2=5\)

=>-x-2=5

=>-x=7

=>x=-7

c: \(3\left(x-2\right)\left(x+3\right)-x\left(3x+1\right)=2\)

=>\(3\left(x^2+x-6\right)-3x^2-x=2\)

=>\(3x^2+3x-18-3x^2-x=2\)

=>2x=20

=>x=10