Mathematics Grade 11 15 min

Division with rational exponents

Division with rational exponents

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1

Introduction & Learning Objectives

Learning Objectives Apply the quotient rule to simplify expressions with rational exponents. Simplify expressions involving negative rational exponents in the numerator or denominator. Convert expressions from radical form to exponential form to perform division. Solve problems involving the division of multiple variables with rational exponents. Evaluate numerical expressions that involve division with rational exponents. Distinguish between subtracting exponents (correct) and dividing exponents (incorrect). Ever wondered how scientists calculate the decay rate of a substance or how engineers scale down complex designs? ⚛️ It often involves dividing quantities raised to fractional powers! This tutorial focuses on the rules for dividing expressions with rational (or fractio...
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Key Concepts & Vocabulary

TermDefinitionExample Rational ExponentAn exponent that is a fraction, in the form m/n, where 'm' represents the power and 'n' represents the root.8^(2/3) is equivalent to (∛8)^2, which simplifies to 2^2 = 4. BaseThe number or variable being raised to a power.In the expression y^(3/4), 'y' is the base. Like BasesTerms that have the exact same base. The quotient rule for exponents only applies to terms with like bases.x^(1/2) and x^(1/4) have like bases. x^(1/2) and y^(1/2) do not. ReciprocalThe multiplicative inverse of a number or expression. A term with a negative exponent is the reciprocal of the term with a positive exponent.The reciprocal of x^(1/2) is 1/x^(1/2), which can also be written as x^(-1/2). Radical FormAn expression that uses a root symbol (√,...
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Core Formulas

Quotient Rule for Exponents x^a / x^b = x^(a-b) When dividing two expressions with the same base, subtract the exponent of the denominator from the exponent of thenumerator. Negative Exponent Rule x^(-a) = 1 / x^a A base raised to a negative exponent is equal to the reciprocal of the base raised to the positive exponent. This is used to ensure final answers contain only positive exponents. Power of a Quotient Rule (x/y)^a = x^a / y^a To raise a fraction to a power, you can raise the numerator and the denominator to that power individually.

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Sample Practice Questions

Easy
Which expression is equivalent to y^(7/3) / y^(2/3)?
A.y^(9/3)
B.y^(14/9)
C.y^(5/3)
D.y^(7/2)
Easy
According to the tutorial, what is the fundamental rule for dividing two expressions with rational exponents and like bases, such as x^a / x^b?
A.Subtract the exponents (a - b).
B.Divide the exponents (a / b).
C.Add the exponents (a + b).
D.Multiply the exponents (a * b).
Easy
Simplify the expression: 9^(5/2) / 9^(3/2).
A.3
B.81
C.1
D.9

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