Q. Fully simplify the expression below and write your answer as a single fraction.5x2−80x+31510x2−10x−420⋅x4−5x3x3−14x2+45xAnswer:
Factor Numerator 1: First, let's factor each polynomial in the expression, if possible. We start with the numerator of the first fraction 10x2−10x−420.Factor out the greatest common factor, which is 10:10(x2−x−42)Now, factor the quadratic:10(x−7)(x+6)
Factor Denominator 1: Next, factor the denominator of the first fraction 5x2−80x+315. Factor out the greatest common factor, which is 5: 5(x2−16x+63) Now, factor the quadratic: 5(x−7)(x−9)
Factor Numerator 2: Now, let's factor the numerator of the second fraction x3−14x2+45x. Factor out the greatest common factor, which is x: x(x2−14x+45) Now, factor the quadratic: x(x−9)(x−5)
Factor Denominator 2: Finally, factor the denominator of the second fraction x4−5x3. Factor out the greatest common factor, which is x3: x3(x−5)
Rewrite with Factored Forms: Now we rewrite the original expression with the factored forms: 5(x−7)(x−9)10(x−7)(x+6)×x3(x−5)x(x−9)(x−5)
Cancel Common Factors: Next, we cancel out the common factors in the numerators and denominators:The (x−7) terms cancel, one (x−9) term cancels, and one (x−5) term cancels. Also, we can cancel one x from the numerator of the second fraction with one x from x3 in the denominator of the second fraction.This leaves us with:510(x+6)×x2x
Simplify Remaining Expression: Now, simplify the remaining expression:The 10 in the numerator and the 5 in the denominator can be simplified to 2.The x in the numerator and one of the x's in x2 in the denominator cancel out.This leaves us with:x2(x+6)
Write Simplified Expression: Finally, we write the simplified expression as a single fraction: x2(x+6)
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