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Choosing a Method to Solve Quadratics

1. Equations and Inequalities / Choosing a Method to Solve Quadratics / 문제 2

문제 2

Solve the following equation by substitution method.
x^2/7 + x^1/7 - 2 = 0

A

x = 1, 128

B

x = 1, - 128

C

x = - 1, 128

D

x = - 1, - 128