what is the sum of the polynomials? (7x³ - 4x²) + (2x³ - 4x²) 5x³ 9x³ 5x³ - 8x² 9x³ - 8x²
what is the sum of the polynomials? (7x³ - 4x²) + (2x³ - 4x²) 5x³ 9x³ 5x³ - 8x² 9x³ - 8x²
Answer
Explanation:
Step1: Combine like - terms of $x^3$
$(7x^{3}+2x^{3})+( - 4x^{2}-4x^{2})$ $=(7 + 2)x^{3}+(-4-4)x^{2}$
Step2: Simplify the coefficients
$9x^{3}-8x^{2}$
Answer:
D. $9x^{3}-8x^{2}$