Q. Factor the following expression completely.x4+2x3−3x2−25x2−50x+75Answer:
Combine Like Terms: First, we need to combine like terms in the expression.x4+2x3−3x2−25x2−50x+75Combine the x2 terms: −3x2−25x2=−28x2The expression becomes:x4+2x3−28x2−50x+75
Factor by Grouping: Next, we look for common factors in groups of terms.Group the terms as follows: (x4+2x3)+(−28x2−50x)+75Now factor by grouping.First group: x3 is a common factor in x4+2x3, so factor it out.x3(x+2)Second group: −2 is a common factor in −28x2−50x, so factor it out.−2(14x2+25x)The expression now looks like this:x3(x+2)−2(14x2+25x)+75
Factor Quadratic Part: We notice that there is no common factor in the second group, and the factoring by grouping does not seem to work directly. Let's try to factor the quadratic part of the expression as if it were a separate quadratic equation.The quadratic part is x4+2x3−28x2.Let's look for two numbers that multiply to give the product of the coefficient of x4 (−1) and the constant term (−28) and add up to the coefficient of x3 (2).The numbers are 4 and −7 because 4×(−7)=−28 and 4+(−7)=−2 (not 2, which indicates a mistake).
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