Rewrite each term:
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- Thus, the factored form is \(\boxed{(x - 3)(x + 3)}\).
- A scientist models nutrient uptake with the equation \[4x^2 - 20x + 25 = 0.\] Find the value of \(x\) that satisfies this equation.
- The equation \(4x^2 - 20x + 25 = 0\) is a quadratic. First, observe if it is a perfect square trinomial by checking if it can be written in the form \((ax + b)^2 = 0\).
- Observe that:
- 4x^2 = (2x)^2, \quad 25 = 5^2, \quad -20x = -2 \cdot 2x \cdot 5
- Thus, the expression is a perfect square:
