A) f(x)= 2x-8 B)g(x) = 5x^2 -x +7

C) h(x) = 4^x-6

D) There is not enough information to determine the answer

1. use commutative property to reorder the terms.2x+81=0.2. move the constant to right side by adding its opposite on both sides. 2x+81-81=0-81.2x=(-81).3. divide the equation on both sides.2x ÷ 2 = 81 ÷ 2.x = -81/2. your answer is -81/2. if you need to simplify it into a decimal, it’s -40.5.