Study the expression. What is the value of the expression when m=2 and n= –3?

(4m–3n2)2

1. Apply the product of powers:      42 m–6n4

2. Substitute values for variables:     (4)2(2)–6(–3)4

3. Apply the negative exponent:      
(4)2(−3)4
26

Complete the steps to evaluate the expression.
Written as an improper fraction, the expression has a value of