Chapter 10 - Radical Expressions and Equations - 10-1 The Pythagorean Theorem - Apply What You've Learned - Page 618: b

x = 2 ft

$192=0.6(16+2x)(12+2x)=0.6($4x^{2}$+56x+192)$ Simplify the equation: $($4x^{2}$+56x+192)=320$ Move everything to one side and solve for x: $x^{2}+14x-32=0$ Next, we factor: $(x-2)(x+16)=0$ The answer is x=2 because x cant be negative.