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Factor the following expression completely.

x^(4)-8x^(3)+7x^(2)-9x^(2)+72 x-63
Answer:

Factor the following expression completely.\newlinex48x3+7x29x2+72x63 x^{4}-8 x^{3}+7 x^{2}-9 x^{2}+72 x-63 \newlineAnswer:

Full solution

Q. Factor the following expression completely.\newlinex48x3+7x29x2+72x63 x^{4}-8 x^{3}+7 x^{2}-9 x^{2}+72 x-63 \newlineAnswer:
  1. Combine Like Terms: First, let's combine like terms in the expression.\newlinex48x3+(7x29x2)+72x63x^4 - 8x^3 + (7x^2 - 9x^2) + 72x - 63\newlinex48x32x2+72x63x^4 - 8x^3 - 2x^2 + 72x - 63
  2. Factor by Grouping: Next, we look for common factors in pairs of terms or try to factor by grouping.\newlineGrouping the first three terms and the last two terms separately:\newline(x48x32x2)+(72x63)(x^4 - 8x^3 - 2x^2) + (72x - 63)
  3. Factor Common Factors: Factor out the greatest common factor from each group. x2(x28x2)+9(8x7)x^2(x^2 - 8x - 2) + 9(8x - 7)
  4. Re-evaluate Quadratic: Now, we look for common factors again or try to factor the quadratic.\newlineThe quadratic x28x2x^2 - 8x - 2 does not factor nicely, and there are no common factors between the two groups.\newlineSo, we check if we made a mistake in grouping or factoring.
  5. Correct Mistake: Upon re-evaluating the expression, we realize that the quadratic x28x2x^2 - 8x - 2 was incorrectly factored. We need to find two numbers that multiply to 2-2 and add up to 8-8. However, there are no such integers, and the quadratic is not factorable over the integers. We must have made a mistake in the previous steps.

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