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Find the equation that results from completing the square into the following equation X squared -14 X +40 equals zero

Find the equation that results from completing the square into the following equation-example-1
User Windbox
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1 Answer

15 votes
15 votes

Given:

The equation is


x^2-14x+40=0

Required:

Find the equation that results from completing the square into the given equation.

Explanation:

The given equation is:


x^(2)-14x+40=0

Subtract 40 on both sides.


\begin{gathered} x^2-14x+40-40=0-40 \\ x^2-14x=-40 \end{gathered}

Add 49 on both sides.


\begin{gathered} x^2-14x+49=-40+49 \\ x^2-14x+49=9 \end{gathered}

Use the following formula:


a^2-2ab+b^2=(a-b)^2
(x-7)^2=9

Final answer:

The second option is the correct answer.

User Florian Schmitt
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3.1k points