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Solving a fourth-degree polynomial equation by using a substitution.

Solve the following fourth-degree equations by substituting z=x^2

a. 5x^4 - 23x^2 + 18 = 0

b. 6x^4 + 21x^2 + 12 = 10x^2 + 8

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A fourth-degree equation is solved by using a substitution. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.