Question

P=3x⁵-4x⁴+5x³-2x+7
Q=15x⁴-8x³+2x²-15x+8
a) tính P+Q
b)tính P-Q 

Answer 1

a) \(P+Q=3x^5-4x^4+5x^3-2x+7+15x^4-8x^3+2x^2-15x+8=3x^5+11x^4-3x^3+2x^2-17x+15\)

b) \(P-Q=3x^5-4x^4+5x^3-2x+7-15x^4+8x^3-2x^2+15x-8=3x^5-19x^4+13x^3-2x^2+13x-1\)

Answer 2

a: Ta có: P+Q

\(=3x^5-4x^4+5x^3-2x+7+15x^4-8x^3+2x^2-15x+8\)

\(=3x^5+11x^4-3x^3-17x+15\)

b: Ta có: P-Q

\(=3x^5-4x^4+5x^3-2x+7-15x^4+8x^3-2x^2+15x-8\)

\(=3x^5-19x^4+13x^3+13x-1\)