The method of completing the square can be used to determine the vertex of a function. he unknown value is -162
<h3>Completing the square of a function</h3>
The method of completing the square can be used to determine the vertex of a function.
Given the quadratic function
-2x² + 36x
-2(x²-18)
Complete the square
-2(x² - 18x + ( -9)²+ 9²)
-2(x-9)² + -2(81)
-2(x-9)² - 162
Compare
On comparing with the expression, you can see that the unknown value is -162
Learn more on completing the square here: brainly.com/question/13981588
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