Simplify (3x+1)^2-(3x-2)(3x+1)
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Answer:
(3x-1)^2 - (3x-2)(3x+1)
= 9x^2 - 6x + 1 - (9x^2 + 3x - 6x -2)
= 9x^2 - 6x + 1 - 9x^2 - 3x + 6x + 2
= -3x + 3
If this was an equation (3x-1)^2 - (3x-2)(3x+1) = 0,
in that case we can find the solution of this equation by
-3x + 3 = 0
x = 1
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