what is the sum of the polynomials?\n$(7x^{3}-4x^{2})+(2x^{3}-4x^{2})$\n$5x^{3}$\n$9x^{3}$\n$5x^{3}-8x^{2}$\n…
what is the sum of the polynomials?\n$(7x^{3}-4x^{2})+(2x^{3}-4x^{2})$\n$5x^{3}$\n$9x^{3}$\n$5x^{3}-8x^{2}$\n$9x^{3}-8x^{2}$
Answer
Explanation:
Step1: Remove the parentheses
[ (7x^{3}-4x^{2})+(2x^{3}-4x^{2})=7x^{3}-4x^{2}+2x^{3}-4x^{2} ]
Step2: Combine like - terms
For the (x^{3}) terms: (7x^{3}+2x^{3}=(7 + 2)x^{3}=9x^{3}) For the (x^{2}) terms: (-4x^{2}-4x^{2}=(-4-4)x^{2}=-8x^{2})
Answer:
(9x^{3}-8x^{2}) (the fourth option)