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Given that 2x + 1 = 5, what is the value of (x + 3)3?

User Xuxu
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1 Answer

6 votes
The answer is: " 125 " .
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Given: " 2x + 1 = 5 " ; what is the value of: " (x + 3) ³ " ?
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Start with: " 2x + 1 = 5 " ; and solve for "x" ?

→ 2x + 1 = 5 ;

Subtract "1" from EACH SIDE of the equation:

→ 2x + 1 − 1 = 5 − 1 ;

to get:

→ 2x = 4 ;

Divide EACH SIDE of the equation by "2" ; to isolate "x" on one side of the equation ; and to solve for "x" ;

2x / 2 = 4 / 2 ;

x = 2 .
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Now, plug in "2" for "x" in the expression:
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→ " (x + 3)³ " ; and simplify the expression ;


→ (2 + 3)³ = 5³ = 5 * 5 * 5 = 25 * 5 = 125 .
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The answer is: " 125 " .
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User Sergey Stolyarov
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