RATIONALIZING THE DENOMINATOR

Front

What does it mean to rationalize the denominator?

Back

Rationalizing the denominator means to eliminate any irrational numbers (like square roots) from the denominator of a fraction.

Tags

CCSS.HSN.RN.A.2

Front

Why is it important to rationalize the denominator?

Back

Rationalizing the denominator simplifies expressions and makes them easier to work with, especially in further calculations.

Tags

CCSS.HSN.RN.A.2

Front

What is the general method for rationalizing a denominator that contains a square root?

Back

Multiply both the numerator and the denominator by the square root present in the denominator.

Front

Rationalize the denominator: 1/√2

Back

(1/√2) * (√2/√2) = √2/2.

Front

Rationalize the denominator: 3/(2+√3)

Back

Multiply by the conjugate: (3/(2+√3)) * ((2-√3)/(2-√3)) = (3(2-√3))/(4-3) = 3(2-√3).

Tags

CCSS.HSN.RN.A.2

Front

What is a conjugate in the context of rationalizing denominators?

Back

The conjugate of a binomial expression a + b is a - b. It is used to eliminate the square root when rationalizing.

Tags

CCSS.HSN.RN.A.2

Front

Rationalize the denominator: 5/(√5 - 1)

Back

Multiply by the conjugate: (5/(√5 - 1)) * ((√5 + 1)/(√5 + 1)) = (5(√5 + 1))/(5 - 1) = (5√5 + 5)/4.

Tags

CCSS.HSN.RN.A.2

Front

What happens if you do not rationalize the denominator?

Back

The expression may remain in a more complex form, making it harder to simplify or use in calculations.

Tags

CCSS.HSN.RN.A.2

Front

Rationalize the denominator: 4/(√7 + 2)

Back

Multiply by the conjugate: (4/(√7 + 2)) * ((√7 - 2)/(√7 - 2)) = (4(√7 - 2))/(7 - 4) = (4√7 - 8)/3.

Tags

CCSS.HSN.RN.A.2

Front

What is the result of rationalizing the denominator of 1/(√3 + √2)?

Back

Multiply by the conjugate: (1/(√3 + √2)) * ((√3 - √2)/(√3 - √2)) = (√3 - √2)/(3 - 2) = √3 - √2.

Tags

CCSS.HSN.RN.A.2