Question

For what value (s) of w, if any, does the expression 5w^(2)+1 equal 81?

Answer 1

4.472

Explanation:

5w^2+1=81

subtract one from each side

5w^2=80

divide 5 on each side

w^2=20

square root each side

w=4.472

Answer 2

5w² + 1 = 81

5w² = 80

w² = 16

w = ±4