Q. Factor the expression completely.x4+4x2+3Answer:
Identify Structure: Identify the structure of the expression.The given expression is x4+4x2+3, which resembles a quadratic in form, where x2 is the variable.
Substitute Variable: Substitute y for x2.\ Let y=x2. Then the expression becomes y2+4y+3.
Factor Quadratic: Factor the quadratic expression.We need to find two numbers that multiply to 3 and add up to 4. These numbers are 1 and 3.So, y2+4y+3 can be factored as (y+1)(y+3).
Substitute Back: Substitute back x2 for y. Replace y with x2 in the factors to get (x2+1)(x2+3).
Check Further Factoring: Check if further factoring is possible.Both x2+1 and x2+3 are sums of squares and cannot be factored further over the real numbers.
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