Which expression is equal to with a rational denominator?
Answer and explanation
Correct answer: A.
- '' adds the radicands in the denominator () instead of subtracting them ().
- '' multiplies by instead of the conjugate .
- '' forgets to divide by the denominator value .
- '' multiplies by instead of the conjugate .
- '' forgets to divide by the denominator value .
- Step 1: Rationalize the denominator by multiplying the numerator and denominator by the conjugate .
- Step 2: Simplify the denominator using the difference of squares: .
- Step 3: Divide the numerator by : .
Answer
.
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