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Y=x^3+4 because if you mulitiply x 3 times and then add it by 4 then you should get y
y = x³ + 4 will be our equationBecause:5=1³ + 45 = 1 +45 = 5 (its correct)129 = 5³ + 4129 = 125 + 4129 = 129
