Y = 4/x^2
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[ x3 - 4x2 + 7x ] / (x) = x2 - 4x + 7
(2, -2)
A number squared is just that number times itself. For example four squared is four times four equals sixteen (42 = 4 x 4 = 16).
x = 2 so x squared = 4 and 2x squared = 2 times 4 = 8; y = 4 so xy = 2 times 4 = 8 and 3xy = 3 times 8 = 24; y squared = 4 times 4 = 16 and 4y squared = 4 times 16 = 64; so 8 + 24 - 64 = 32 - 64 = -32
4