Algebra
posted by Maddy .
please help me with this question and check my answers.
Solve the problem.
A rectangle with width 2x + 5 inches has an area of 2x4 + 9x3  12x2  79x  60 square inches. Write a polynomial that represents its length. ( I don't know how to solve this problem)
Use synthetic division and the Remainder Theorem to find the indicated function value.
f(x) = x^4 + 4x^3 + 8x^2  5x + 3; f(2)
I GOT 29
f(x) = 4x^3  3x^2  3x + 20; f(2)
i got 18
f(x) = 6x^4 + 9x^3 + 5x^2  6x + 24; f(3)
i got 330
Use synthetic division to divide f(x) = x^3 + 7x^2  6x  72 by x + 4. Use the result to find all zeros of f.
i got {4,6,3}
Use synthetic division to show that the number given to the right of the equation is a solution of the equation, then solve the polynomial equation.
x^3 + 5x^2 + 2x  8 = 0; 2
i got {1,4,2}
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