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Factor the following expression completely.

x^(4)-x^(3)-90x^(2)-x^(2)+x+90
Answer:

Factor the following expression completely.\newlinex4x390x2x2+x+90 x^{4}-x^{3}-90 x^{2}-x^{2}+x+90 \newlineAnswer:

Full solution

Q. Factor the following expression completely.\newlinex4x390x2x2+x+90 x^{4}-x^{3}-90 x^{2}-x^{2}+x+90 \newlineAnswer:
  1. Identify like terms: Identify like terms in the expression x4x390x2x2+x+90x^4 - x^3 - 90x^2 - x^2 + x + 90 and combine them.\newlineCalculation: 90x2x2=91x2-90x^2 - x^2 = -91x^2\newlineThe expression becomes x4x391x2+x+90x^4 - x^3 - 91x^2 + x + 90.
  2. Combine like terms: Look for common factors in groups of terms. We can group the first three terms and the last three terms separately.\newlineGrouping: (x4x391x2)+(x+90)(x^4 - x^3 - 91x^2) + (x + 90)
  3. Group terms: Factor out the greatest common factor from the first group, which is x2x^2. Calculation: x2(x2x91)x^2(x^2 - x - 91) The expression now is x2(x2x91)+(x+90)x^2(x^2 - x - 91) + (x + 90).
  4. Factor out common factor: Notice that there is no common factor in the second group (x+90)(x + 90), so we leave it as is.\newlineThe expression remains x2(x2x91)+(x+90)x^2(x^2 - x - 91) + (x + 90).
  5. Factor quadratic: Now, we need to factor the quadratic x2x91x^2 - x - 91. Look for two numbers that multiply to 91-91 and add up to 1-1.\newlineCalculation: The numbers are 13-13 and 77 because 13×7=91-13 \times 7 = -91 and 13+7=6-13 + 7 = -6.\newlineThere is a mistake here; the numbers should add up to 1-1, not 6-6. We need to find the correct pair of numbers.

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