For making a perfect square we will add 16 on both sides of the given equation.
What is quadratic equation?
The polynomial having a degree of two or the maximum power of the variable in a polynomial will be 2 is defined as the quadratic equation and it will cut two intercepts on the graph at the x-axis.
Given equation is:-
x² - 8x = 5
x² - 8x + 16 = 5 + 16
x² - 4x -4x + 16 = 5 + 16
x ( x - 4 ) -4 (x - 4 ) = 21
( x - 4 )² = 21
Therefore to make a perfect square we will add 16 on both sides of the given equation.
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