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Factor the following expression completely.

x^(4)-4x^(2)-7x^(3)+28 x+10x^(2)-40
Answer:

Factor the following expression completely.\newlinex44x27x3+28x+10x240 x^{4}-4 x^{2}-7 x^{3}+28 x+10 x^{2}-40 \newlineAnswer:

Full solution

Q. Factor the following expression completely.\newlinex44x27x3+28x+10x240 x^{4}-4 x^{2}-7 x^{3}+28 x+10 x^{2}-40 \newlineAnswer:
  1. Rearrange terms in descending order: First, we should rearrange the terms of the polynomial in descending order of the powers of xx.x47x3+6x2+28x40x^4 - 7x^3 + 6x^2 + 28x - 40
  2. Look for common factors: Next, we look for common factors in groups of terms. We can group the terms as follows: x47x3x^4 - 7x^3 + 6x2+28x6x^2 + 28x - 40-40.
  3. Factor by grouping: Factor by grouping. For the first group x47x3x^4 - 7x^3, we can factor out an x3x^3, and for the second group 6x2+28x6x^2 + 28x, we can factor out a 2x2x. This gives us:\newlinex3(x7)+2x(3x+14)40x^3(x - 7) + 2x(3x + 14) - 40
  4. Find common factor: We notice that the term 4040 does not have a common factor with the other groups. However, we can still look for a common factor between the terms x3(x7)x^3(x - 7) and 2x(3x+14)2x(3x + 14). We see that there is no common factor, so we need to look for a different approach to factor the expression completely.
  5. Try different grouping: Let's try to factor by grouping in a different way. We can rearrange the terms to see if there's a better grouping: x47x3+10x24x2+28x40x^4 - 7x^3 + 10x^2 - 4x^2 + 28x - 40 Now, we group them as follows: (x47x3+10x2)+(4x2+28x40)(x^4 - 7x^3 + 10x^2) + (-4x^2 + 28x - 40).
  6. Factor by grouping again: For the first group x47x3+10x2x^4 - 7x^3 + 10x^2, we can factor out an x2x^2, and for the second group 4x2+28x40-4x^2 + 28x - 40, we can factor out a 4-4. This gives us:\newlinex2(x27x+10)4(x27x+10)x^2(x^2 - 7x + 10) - 4(x^2 - 7x + 10)
  7. Factor out common factor: We now have a common factor of (x27x+10)(x^2 - 7x + 10) in both groups. We can factor this out: (x27x+10)(x24)(x^2 - 7x + 10)(x^2 - 4)
  8. Factor simple trinomial: The quadratic x27x+10x^2 - 7x + 10 can be factored further since it is a simple trinomial. We look for two numbers that multiply to 1010 and add up to 7-7. These numbers are 5-5 and 2-2. So we can write:\newline(x5)(x2)(x24)(x - 5)(x - 2)(x^2 - 4)
  9. Factor difference of squares: The term x24x^2 - 4 is a difference of squares and can be factored as (x+2)(x2)(x + 2)(x - 2). So the fully factored form of the expression is:\newline(x5)(x2)(x+2)(x2)(x - 5)(x - 2)(x + 2)(x - 2)
  10. Final fully factored form: We notice that (x2)(x - 2) is repeated, so we can write it with an exponent:\newline(x5)(x2)2(x+2)(x - 5)(x - 2)^2(x + 2)\newlineThis is the completely factored form of the expression.

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