Identify Common Factor: First, we identify the common factor in all terms of the polynomial 40x−2x2−2x3. The common factor is 2x, as it is the greatest common factor that can be divided evenly into each term.
Factor Out Common Factor: Next, we factor out the common factor 2x from each term of the polynomial.2x(20−x−x2)
Rearrange Terms: We notice that the order of the terms inside the parentheses is not standard. We should rearrange the terms in descending order of the powers of x. 2x(−x2−x+20)
Factor Quadratic Expression: Now, we look to factor the quadratic expression inside the parentheses. We need two numbers that multiply to −20 (the constant term) and add up to −1 (the coefficient of the middle term).The numbers that satisfy these conditions are −5 and 4.
Split Middle Term: We factor the quadratic expression by splitting the middle term using the numbers −5 and 4.2x(−x2−5x+4x+20)
Factor by Grouping: Next, we group the terms in pairs and factor by grouping. 2x[(−x2−5x)+(4x+20)]
Factor Out Common Factor: We factor out the common factor from each group. 2x[−x(x+5)+4(x+5)]
Factor Out Common Factor: We notice that (x+5) is a common factor in both groups, so we factor it out.2x(x+5)(−x+4)
Write Completely Factored Form: Finally, we write the completely factored form of the polynomial, ensuring that all signs are correct.2x(x+5)(−x+4) is the completely factored form of the polynomial.
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