Make the given changes in the indicated examples of this section and then solve the resulting equations by the quadratic formula.

In Example 2, change the coefficient of x² from 2 to 3.

Data from Example 2

Substituting the values for a, b, and c in the quadratic formula, we have

The exact roots are

(this form is often used when the roots are irrational). Approximate decimal values are x = 4.108 and x = −0.6085.

Solve: 2x a = 2 7x b = -7 I 5 = 0. c = C -5