# trigonometry

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Complete the square to Solve Quadratic Equation:
-x^2-7x=-11

• trigonometry -

-x^2-7x+11=0
you multiply all of it by -1 to change the x into postive.
therefore,
x^2+7x-11=0
then apply this to the fo9rmula
-b+- the sqaure root of (b^2 - 4*a*c)/2a

where a = 1
b=7
c=-11

work out the answer, its very easy (:

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