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Solution:
(3x + 2)2 + 7(3x + 2) - 8 = 0 …. (1)
Consider 3x + 2 = u …. (2)
Substituting it in quadratic equation (1)
u2 + 7u - 8 = 0
Therefore, the equivalent quadratic equation is u2 + 7u - 8 = 0.
Summary:
Using substitution, the equivalent quadratic equation of (3x + 2)2 + 7(3x + 2) - 8 = 0 is u2 + 7u - 8 = 0.