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Perform the following operation and express in simplest form.

(x^(2)-11 x+28)/(x^(2)-16)*(x^(2)+4x)/(x-4)
Answer:

Perform the following operation and express in simplest form.\newlinex211x+28x216x2+4xx4 \frac{x^{2}-11 x+28}{x^{2}-16} \cdot \frac{x^{2}+4 x}{x-4} \newlineAnswer:

Full solution

Q. Perform the following operation and express in simplest form.\newlinex211x+28x216x2+4xx4 \frac{x^{2}-11 x+28}{x^{2}-16} \cdot \frac{x^{2}+4 x}{x-4} \newlineAnswer:
  1. Factor Quadratic Expressions: First, factor the quadratic expressions where possible.\newlineThe numerator x211x+28x^2 - 11x + 28 can be factored into (x7)(x4)(x - 7)(x - 4).\newlineThe denominator x216x^2 - 16 is a difference of squares and can be factored into (x4)(x+4)(x - 4)(x + 4).
  2. Write Factored Expression: Now, write the expression with the factored forms:\newline((x7)(x4))/(x216)(x2+4x)/(x4)((x - 7)(x - 4))/(x^2 - 16) * (x^2 + 4x)/(x - 4)\newlineReplace the factored form of x216x^2 - 16 into (x4)(x+4)(x - 4)(x + 4):\newline((x7)(x4))/((x4)(x+4))(x2+4x)/(x4)((x - 7)(x - 4))/((x - 4)(x + 4)) * (x^2 + 4x)/(x - 4)
  3. Cancel Common Factors: Next, cancel out the common factors in the numerator and the denominator.\newlineThe (x4)(x - 4) term is present in both the numerator and the denominator, so they cancel each other out.\newlineAfter canceling, the expression becomes:\newlinex7x+4×x2+4xx4\frac{x - 7}{x + 4} \times \frac{x^2 + 4x}{x - 4}\newlineNow, cancel out the (x4)(x - 4) term in the second fraction:\newlinex7x+4×x(x+4)x4\frac{x - 7}{x + 4} \times \frac{x(x + 4)}{x - 4}
  4. Simplify Expression: After canceling, we see that the (x+4)(x + 4) term is also present in both the numerator and the denominator, so they cancel each other out as well.\newlineThe expression simplifies to:\newline(x7)×x(x - 7) \times x
  5. Multiply Remaining Terms: Finally, multiply out the remaining terms:\newlinex(x7)=x27xx(x - 7) = x^2 - 7x\newlineThis is the simplified form of the original expression.

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