Q. Factor the following expression completely.x4−16x2−x3+16x−2x2+32Answer:
Rearrange and Combine Terms: First, let's rearrange the terms of the expression in descending order of the powers of x.x4−x3−16x2−2x2+16x+32Combine like terms.x4−x3−18x2+16x+32
Look for Common Factors: Now, let's look for common factors in groups of terms.Group the terms as follows: (x4−x3)+(−18x2+16x)+32Factor out the common factor x3 from the first group and 2x from the second group.x3(x−1)−2x(9x−8)+32
Factor by Grouping: We notice that there is no common factor that we can factor out from all terms, but we can look for a pattern or try to factor by grouping.Let's try to factor by grouping by rearranging the terms again:x4−x3 - 18x2−16x + 32Factor out x3 from the first group and 2x from the second group.x3(x−1) - 2x(9x−8) + 32
Factor by Grouping in Pairs: Now, we look for a common binomial factor between the groups.We can see that there is no common binomial factor, which means we need to try a different approach.Let's try to factor by grouping in pairs:x4−16x2 - x3−16x - 2x2−32Factor out x2 from the first pair and x from the second pair.x2(x2−16)−x(x2−16)−2(x2−16)
Identify Common Factor: Now we can see that (x2−16) is a common factor.Factor out (x2−16) from each group.(x2−16)(x2−x−2)
Factor Difference of Squares: The expression x2−16 is a difference of squares and can be factored further.Factor x2−16 into (x+4)(x−4).(x+4)(x−4)(x2−x−2)
Factor Quadratic: The quadratic x2−x−2 can be factored into two binomials.Factor x2−x−2 into (x−2)(x+1).(x+4)(x−4)(x−2)(x+1)
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