# Chapter 11 - Quadratic Functions and Equations - 11.5 Equations Reducible to Quadratic - 11.5 Exercise Set - Page 731: 7

Fill the blank with $(x^{2}+3)$

#### Work Step by Step

With substitution $u=(x^{2}+3)$, then $u^{2}=(x^{2}+3)^{2}.$ The equation becomes $u^{2}+u-7=0$

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