Question

What is the positive solution to the equation 3x2 + 31 = 912

A 10.95
B 8.51
8.36
D 7.75
E 4.47

Answer 1

4.47

Explanation:

the only rational answer for this is 4.47 because once you solve as much as you can, you should end up with a whole number multiplied by a square root. the decimal form of that number is 4.47

Answer 2

E) 4.47

Explanation:

3x²+31=91

3x²=91-31

3x²=60

x²=60÷3

x²=20

x=√20

x=4.47