8th Grade Algebra
posted by Bridget .
Multiply.
1) (3t^2  2t  4) * (5t + 9)
Writing.
1) Explain why the product of a quadratic polynomial and a linear polynomial must be a cubic polynomial.

(3t^2  2t  4) * (5t + 9)
Multiply each term in one set of parentheses by each term in the other set of parentheses.
3t^2(5t + 9)  2t(5t + 9)  4(5t + 9)
15t^3 + 27t^2  10t^2  18t  20t  36
combine like terms
15t^3 + (27t^2  10t^2) + ( 18t  20t)  36
15t^3 + 17t^2 38t  36
A quadratic has a power of 2 as its highest exponent, and a linear has a power of 1 as its highest exponent. When those highest exponents are multiplied together, they will result in a highest exponent of 2 + 1 = 3.
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