912 Evaluate Evaluate each expression. Express your answers as a fraction in lowest terms.
(a)

(b)

a)
To evaluate:
The given expression
Given information:
The given expression is
Approach:
Subtracting fraction with same denominator:
Calculation:
First, we have to factor the denominator into prime factors.
Now, we have to find the least common denominator (LCD) by forming the product of all the prime factors that occur in this factorization, using the highest power of each prime factor.
Thus, the LCD is
b)
To evaluate:
The given expression
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