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Factor the following expression completely.

x^(4)-3x^(3)+2x^(2)-9x^(2)+27 x-18
Answer:

Factor the following expression completely.\newlinex43x3+2x29x2+27x18 x^{4}-3 x^{3}+2 x^{2}-9 x^{2}+27 x-18 \newlineAnswer:

Full solution

Q. Factor the following expression completely.\newlinex43x3+2x29x2+27x18 x^{4}-3 x^{3}+2 x^{2}-9 x^{2}+27 x-18 \newlineAnswer:
  1. Combine like terms: First, let's rewrite the expression by combining like terms. \newlinex43x3+(2x29x2)+27x18x^4 - 3x^3 + (2x^2 - 9x^2) + 27x - 18\newlinex43x37x2+27x18x^4 - 3x^3 - 7x^2 + 27x - 18
  2. Factor by grouping: Now, we look for common factors in pairs of terms or try to factor by grouping.\newlineGroup the terms as follows: x43x3x^4 - 3x^3 + 7x2+27x -7x^2 + 27x - 1818
  3. Factor out common factors: Factor out the greatest common factor from each group.\newlinex3(x3)7x(x3)18x^3(x - 3) - 7x(x - 3) - 18\newlineNotice that (x3)(x - 3) is a common factor in the first two groups.
  4. Factor remaining term: Now, factor (x3)(x - 3) out of the first two groups.(x3)(x37x)18(x - 3)(x^3 - 7x) - 18
  5. Cannot factor further: We can't factor x37xx^3 - 7x further using integer coefficients, but we can factor out an xx.(x3)(x(x27))18(x - 3)(x(x^2 - 7)) - 18
  6. Cannot factor further: We can't factor (x37x)(x^3 - 7x) further using integer coefficients, but we can factor out an xx.(x3)(x(x27))18(x - 3)(x(x^2 - 7)) - 18Now, we look at the remaining term, 18-18, to see if it can be factored with (x3)(x - 3).Since 1818 is not a multiple of (x3)(x - 3), we cannot factor it out directly. However, we can look for a pattern or a common factor that includes 18-18 and the rest of the expression.
  7. Cannot factor further: We can't factor (x37x)(x^3 - 7x) further using integer coefficients, but we can factor out an xx.(x3)(x(x27))18(x - 3)(x(x^2 - 7)) - 18Now, we look at the remaining term, 18-18, to see if it can be factored with (x3)(x - 3).Since 1818 is not a multiple of (x3)(x - 3), we cannot factor it out directly. However, we can look for a pattern or a common factor that includes 18-18 and the rest of the expression.We notice that the expression does not have a common factor that includes 18-18. Therefore, we cannot factor it with the rest of the expression. The expression is already factored as much as possible with integer coefficients.

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