Simplify $\dfrac{x^{a} \cdot x^{b}}{x^{c}}$ for $x \ne 0$.
A$x^{a \cdot b - c}$
B$x^{a + b - c}$
C$x^{abc}$
D$x^{a + b + c}$
Answer & Solution
Correct answer: B. $x^{a + b - c}$
Product rule: $x^{a} \cdot x^{b} = x^{a+b}$. Quotient rule: $\dfrac{x^{a+b}}{x^{c}} = x^{a+b-c}$.
- Trap A adds all exponents (forgets the quotient sign).
- Trap C/D confuse addition/multiplication of exponents.
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