Question

mx:-5+3x²-4x⁴+x³

nx=3x⁴-2x+2x³

Px=-8+5x-6x³

a)tính mx-nx

b)tính nx-px+mx

Answer 1

a: \(M\left(x\right)-N\left(x\right)\)

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

\(=-7x^4-x^3+3x^2+2x-5\)

b: N(x)-P(x)+M(x)

\(=-4x^4+x^3+3x^2-5+8-5x+6x^3-3x^4+2x-2x^3\)

\(=-7x^4+5x^3+3x^2-3x+3\)

Answer 2

a) \(M\left(x\right)-N\left(x\right)=-5+3x^2-4x^4+x^3-\left(3x^4-2x\right)+2x^3\)
\(=-7x^4+3x^3+5x^2-5\)
b) \(N\left(x\right)-P\left(x\right)+N\left(x\right)\)
\(=3x^4-2x+2x^3+\left(-5\right)+3x^2-4x^4+x^3-\left(-8+5x-6x^3\right)\)
\(=-4x^4+9x^3-7x+3\)