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Factor completely.

5x^(3)+55x^(2)+120 x
Answer:

Factor completely.\newline5x3+55x2+120x 5 x^{3}+55 x^{2}+120 x \newlineAnswer:

Full solution

Q. Factor completely.\newline5x3+55x2+120x 5 x^{3}+55 x^{2}+120 x \newlineAnswer:
  1. Identify GCF: Identify the greatest common factor (GCF) of the terms in the polynomial 5x3+55x2+120x5x^3 + 55x^2 + 120x. The GCF of 5x35x^3, 55x255x^2, and 120x120x is 5x5x, since each term is divisible by 5x5x. Factor out the GCF from each term.
  2. Factor out GCF: Write the polynomial as a product of the GCF and the remaining terms.\newline5x3+55x2+120x=5x(x2+11x+24)5x^3 + 55x^2 + 120x = 5x(x^2 + 11x + 24)\newlineCheck that the terms inside the parentheses are correct by distributing 5x5x back to each term.\newline5x(x2)+5x(11x)+5x(24)=5x3+55x2+120x5x(x^2) + 5x(11x) + 5x(24) = 5x^3 + 55x^2 + 120x, which matches the original polynomial.
  3. Write as product: Factor the quadratic expression inside the parentheses.\newlineThe quadratic x2+11x+24x^2 + 11x + 24 can be factored into two binomials because it is a simple trinomial.\newlineFind two numbers that multiply to 2424 and add to 1111. These numbers are 88 and 33.\newlineWrite the factored form of the quadratic: (x+8)(x+3)(x + 8)(x + 3).
  4. Factor quadratic: Combine the GCF with the factored quadratic to write the completely factored form of the original polynomial.\newline5x3+55x2+120x=5x(x+8)(x+3)5x^3 + 55x^2 + 120x = 5x(x + 8)(x + 3)\newlineCheck that the factored form is correct by expanding the binomials and multiplying by 5x5x to see if it gives the original polynomial.\newline5x(x+8)(x+3)=5x(x2+11x+24)=5x3+55x2+120x5x(x + 8)(x + 3) = 5x(x^2 + 11x + 24) = 5x^3 + 55x^2 + 120x, which is correct.

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