Q. Factor the expression completely.x4−4x2+3Answer:
Identify Polynomial Type: Identify the type of polynomial and look for a factoring strategy.The given expression is a quadratic in form, but with a variable to the fourth power:x4−4x2+3This can be treated as a quadratic with x2 taking the place of x.
Factor as Quadratic: Factor the expression as if it were a quadratic.We are looking for two binomials that multiply to give x4−4x2+3. The factors of 3 that subtract to give 4 are −1 and −3.(x2−1)(x2−3)
Check for Further Factoring: Check if the binomials can be factored further.The binomial x2−1 is a difference of squares and can be factored further.x2−1=(x+1)(x−1)The binomial x2−3 cannot be factored further over the integers.
Write Completely Factored Form: Write the completely factored form of the expression.The completely factored form of the expression is:(x+1)(x−1)(x2−3)
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