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Question

Solve for x:
x3+13=5

A
x=14
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B
x=3
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C
x=15
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D
x=5
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Solution

The correct option is A x=14
Given, the equation is x3+13=5.

Step 1: Subtract both sides of the equation by 13 in order to remove the 13 on the left hand side.
x3+1313=513
x3=513 (1313=0)
x3=5×31×313 (making the denominators equal for 5 and 13)
x3=15313
x3=1513
x3=143

Step 2: Multiply both the sides by 3
x3×3=143×3
x=14

Hence, the solution of the equation x3+13=5 is x=14.

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