Question

Bài 4: Cho hai đa thức:

P(x)= \(x^5-2x^2+7x^4-9x^3-x+2x^2-5x^4\)

Q(x)= \(5x^4-x^5+4x^2-6+9x^3-8+x^5\)

c) Tính M(x)=P(x) + Q(x)

d) Tính M(2),M(-2),M(\(\dfrac{1}{2}\))

Answer 1

a: \(P\left(x\right)=x^5+2x^4-9x^3-x\)

\(Q\left(x\right)=5x^4+9x^3+4x^2-14\)

c:: \(M\left(x\right)=P\left(x\right)+Q\left(x\right)=x^5+7x^4+4x^2-x-14\)

d: \(M\left(2\right)=32+7\cdot16+4\cdot4-2-14=144\)

\(M\left(-2\right)=-32+7\cdot16+4\cdot4+2-14=84\)