Anything times zero is zero, even itself.
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Factor it. y(4y - 1)(3y - 2) = 0 y = 0, 1/4, 2/3
0 to any power is 0.
Any negative number to the power of 0 is always -1
91 to the 2nd power is 8,281.
21 to the 2nd power is 441.