# 5. Equations in Quadratic Form

In this section, we'll come across equations that are in fact quadratic, but they may not look like it at first glance.

We'll use either of the following methods to solve such equations:

• Factoring
• Quadratic formula: x=(-b+-sqrt(b^2-4ac))/(2a)

### Example 1

Solve: x4 − 20x2 + 64 = 0

### Example 2

Solve: 4x+3sqrtx=1

Continues below

### Exercises

1. Solve:  4x^4+ 15x^2= 4

2. Solve 10x^-2+3x^-1-1=0

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