Q. Perform the following operation and express in simplest form.x2−16x2−11x+28⋅x−4x2+4xAnswer:
Factor Quadratic Expressions: First, factor the quadratic expressions where possible.The numerator x2−11x+28 can be factored into (x−7)(x−4).The denominator x2−16 is a difference of squares and can be factored into (x−4)(x+4).
Write Factored Expression: Now, write the expression with the factored forms:((x−7)(x−4))/(x2−16)∗(x2+4x)/(x−4)Replace the factored form of x2−16 into (x−4)(x+4):((x−7)(x−4))/((x−4)(x+4))∗(x2+4x)/(x−4)
Cancel Common Factors: Next, cancel out the common factors in the numerator and the denominator.The (x−4) term is present in both the numerator and the denominator, so they cancel each other out.After canceling, the expression becomes:x+4x−7×x−4x2+4xNow, cancel out the (x−4) term in the second fraction:x+4x−7×x−4x(x+4)
Simplify Expression: After canceling, we see that the (x+4) term is also present in both the numerator and the denominator, so they cancel each other out as well.The expression simplifies to:(x−7)×x
Multiply Remaining Terms: Finally, multiply out the remaining terms:x(x−7)=x2−7xThis is the simplified form of the original expression.
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