Q. Perform the following operation and express in simplest form.x−9x+6÷x2−18x+81x2−3x−54Answer:
Identify Given Expression: Identify the given expression and rewrite the division as multiplication by the reciprocal of the second fraction.The expression is (x+6)/(x−9)÷(x2−3x−54)/(x2−18x+81), which can be rewritten as (x+6)/(x−9)×(x2−18x+81)/(x2−3x−54).
Factor Second Fraction: Factor both the numerator and the denominator of the second fraction.The numerator x2−18x+81 can be factored as (x−9)(x−9) or (x−9)2.The denominator x2−3x−54 can be factored as (x−9)(x+6).
Rewrite with Factored Terms: Rewrite the expression with the factored terms.The expression now looks like (x+6)/(x−9)×((x−9)(x−9))/((x−9)(x+6)).
Cancel Common Terms: Cancel out the common terms in the numerator and the denominator.The (x+6) terms cancel each other out, and one of the (x−9) terms cancels out, leaving us with (x−9)1×(x−9).
Simplify Remaining Expression: Simplify the remaining expression.After canceling out, the expression simplifies to 1, since (x−9)1×(x−9)=1.
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