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Fully simplify the expression below and write your answer as a single fraction.

(10x^(2)-10 x-420)/(5x^(2)-80 x+315)*(x^(3)-14x^(2)+45 x)/(x^(4)-5x^(3))
Answer:

Fully simplify the expression below and write your answer as a single fraction.\newline10x210x4205x280x+315x314x2+45xx45x3 \frac{10 x^{2}-10 x-420}{5 x^{2}-80 x+315} \cdot \frac{x^{3}-14 x^{2}+45 x}{x^{4}-5 x^{3}} \newlineAnswer:

Full solution

Q. Fully simplify the expression below and write your answer as a single fraction.\newline10x210x4205x280x+315x314x2+45xx45x3 \frac{10 x^{2}-10 x-420}{5 x^{2}-80 x+315} \cdot \frac{x^{3}-14 x^{2}+45 x}{x^{4}-5 x^{3}} \newlineAnswer:
  1. Factor Numerator 11: First, let's factor each polynomial in the expression, if possible. We start with the numerator of the first fraction 10x210x42010x^2 - 10x - 420.\newlineFactor out the greatest common factor, which is 1010:\newline10(x2x42)10(x^2 - x - 42)\newlineNow, factor the quadratic:\newline10(x7)(x+6)10(x - 7)(x + 6)
  2. Factor Denominator 11: Next, factor the denominator of the first fraction 5x280x+3155x^2 - 80x + 315. Factor out the greatest common factor, which is 55: 5(x216x+63)5(x^2 - 16x + 63) Now, factor the quadratic: 5(x7)(x9)5(x - 7)(x - 9)
  3. Factor Numerator 22: Now, let's factor the numerator of the second fraction x314x2+45xx^3 - 14x^2 + 45x. Factor out the greatest common factor, which is xx: x(x214x+45)x(x^2 - 14x + 45) Now, factor the quadratic: x(x9)(x5)x(x - 9)(x - 5)
  4. Factor Denominator 22: Finally, factor the denominator of the second fraction x45x3x^4 - 5x^3. Factor out the greatest common factor, which is x3x^3: x3(x5)x^3(x - 5)
  5. Rewrite with Factored Forms: Now we rewrite the original expression with the factored forms: 10(x7)(x+6)5(x7)(x9)×x(x9)(x5)x3(x5)\frac{10(x - 7)(x + 6)}{5(x - 7)(x - 9)} \times \frac{x(x - 9)(x - 5)}{x^3(x - 5)}
  6. Cancel Common Factors: Next, we cancel out the common factors in the numerators and denominators:\newlineThe (x7)(x - 7) terms cancel, one (x9)(x - 9) term cancels, and one (x5)(x - 5) term cancels. Also, we can cancel one xx from the numerator of the second fraction with one xx from x3x^3 in the denominator of the second fraction.\newlineThis leaves us with:\newline10(x+6)5×xx2\frac{10(x + 6)}{5} \times \frac{x}{x^2}
  7. Simplify Remaining Expression: Now, simplify the remaining expression:\newlineThe 1010 in the numerator and the 55 in the denominator can be simplified to 22.\newlineThe xx in the numerator and one of the xx's in x2x^2 in the denominator cancel out.\newlineThis leaves us with:\newline2(x+6)x\frac{2(x + 6)}{x}
  8. Write Simplified Expression: Finally, we write the simplified expression as a single fraction: 2(x+6)x\frac{2(x + 6)}{x}

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