x2-9x can be factored by taking x out of each term
x(x-9)
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If you are looking for the zeros of this function: x = -2 plus or minus 2 X the square root of 5.
x equals negative b plus or minus the square root of b squared minus 4bc over 2a
-cos2(x)1 = sin2(x) +cos2(x)1 - cos2(x) = sin2(x)-cos2(x) = sin2(x) - 1
6 squared = 3 squared + x squared if x is the height (altitude) of the triangle 36 = 9+x squared x squared =27 so x = 3 sqrt3 = 5.19615
Without an equality sign it can not be considered to be an equation and the - or + value of 9x has not been given