Question

Cho 2 đa thức

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

Q(x)=2^2+4x-1

a)tính P(x)+Q(x)

b)tính P(x)-Q(x)

Answer 1

a/ P(x)+Q(x) = \(4x^3+x^2-x+5+2^2+4x-1\)

= \(4x^3+x^2+3x+8\)

b/ P(x)-Q(x)= \(4x^3+x^2-x+5-2^2-4x+1\)

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

Answer 2

a)

\(P\left(x\right)+Q\left(x\right)=\left(4x^3+x^2-x+5\right)+\left(x^2+4x-1\right)\)

\(=4x^3+x^2-x+5+x^2+4x-1\)

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

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

mik nghĩ bạn viết sai đề chỗ \(2^2\)

Answer 3

a)

\(P\left(x\right)+Q\left(x\right)=4x^3+x^2-x+5+2^2+4x-1=4x^3+x^2+3x+8\)

b)

\(P\left(x\right)-Q\left(x\right)=4x^3+x^2-x+5-2^2-4x+1=4x^3+x^2-5x+2\)