SOLUTION: what is (x^2+9x)(x^2-9x) multiplied
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Question 348213
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what is (x^2+9x)(x^2-9x) multiplied
Answer by
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(x^2+9x)(x^2-9x) =
USE THE FOIL METHOD.
x^2 * x^2 = x^4
x^2 * - 9x = -9x^3
9x * x^2 = 9x^3
9x * -9x = -81x^2
Put it all together and combine like terms.
x^4 - 9x^3 + 9x^3 - 81x^2
x^4 - 81x^2
We now factor.
x^2(x^2 - 81)
We now factor what lies in the parentheses.
Final Answer: x^2 (x - 9) (x + 9)