How to subtract rational expressions with different denominators - PSAT Math
Card 1 of 7
Simplify.
Simplify.
Tap to reveal answer
Determine an LCD (Least Common Denominator) between 
and 
.
LCD = 
Multiply the top and bottom of the first rational expression by 
, so that the denominator will be 
.
Distribute the 
to 
.
Now you can subtract because both rational expressions have the same denominators.
Final Answer.
Determine an LCD (Least Common Denominator) between
LCD =
Multiply the top and bottom of the first rational expression by
Distribute the
Now you can subtract because both rational expressions have the same denominators.
Final Answer.
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Simplify.
Simplify.
Tap to reveal answer
Determine an LCD (Least Common Denominator) between and .
LCD =
Multiply the top and bottom of the first rational expression by , so that the denominator will be .
Distribute the to .
Now you can subtract because both rational expressions have the same denominators.
Final Answer.
Determine an LCD (Least Common Denominator) between
LCD =
Multiply the top and bottom of the first rational expression by
Distribute the
Now you can subtract because both rational expressions have the same denominators.
Final Answer.
← Didn't Know|Knew It →
Simplify.
Simplify.
Tap to reveal answer
Determine an LCD (Least Common Denominator) between and .
LCD =
Multiply the top and bottom of the first rational expression by , so that the denominator will be .
Distribute the to .
Now you can subtract because both rational expressions have the same denominators.
Final Answer.
Determine an LCD (Least Common Denominator) between
LCD =
Multiply the top and bottom of the first rational expression by
Distribute the
Now you can subtract because both rational expressions have the same denominators.
Final Answer.
← Didn't Know|Knew It →
Simplify.
Simplify.
Tap to reveal answer
Determine an LCD (Least Common Denominator) between and .
LCD =
Multiply the top and bottom of the first rational expression by , so that the denominator will be .
Distribute the to .
Now you can subtract because both rational expressions have the same denominators.
Final Answer.
Determine an LCD (Least Common Denominator) between
LCD =
Multiply the top and bottom of the first rational expression by
Distribute the
Now you can subtract because both rational expressions have the same denominators.
Final Answer.
← Didn't Know|Knew It →
Simplify.
Simplify.
Tap to reveal answer
Determine an LCD (Least Common Denominator) between and .
LCD =
Multiply the top and bottom of the first rational expression by , so that the denominator will be .
Distribute the to .
Now you can subtract because both rational expressions have the same denominators.
Final Answer.
Determine an LCD (Least Common Denominator) between
LCD =
Multiply the top and bottom of the first rational expression by
Distribute the
Now you can subtract because both rational expressions have the same denominators.
Final Answer.
← Didn't Know|Knew It →
Simplify.
Simplify.
Tap to reveal answer
Determine an LCD (Least Common Denominator) between and .
LCD =
Multiply the top and bottom of the first rational expression by , so that the denominator will be .
Distribute the to .
Now you can subtract because both rational expressions have the same denominators.
Final Answer.
Determine an LCD (Least Common Denominator) between
LCD =
Multiply the top and bottom of the first rational expression by
Distribute the
Now you can subtract because both rational expressions have the same denominators.
Final Answer.
← Didn't Know|Knew It →
Simplify.
Simplify.
Tap to reveal answer
Determine an LCD (Least Common Denominator) between and .
LCD =
Multiply the top and bottom of the first rational expression by , so that the denominator will be .
Distribute the to .
Now you can subtract because both rational expressions have the same denominators.
Final Answer.
Determine an LCD (Least Common Denominator) between
LCD =
Multiply the top and bottom of the first rational expression by
Distribute the
Now you can subtract because both rational expressions have the same denominators.
Final Answer.
← Didn't Know|Knew It →