Question

y varies directly as the square of x. When x = 3, y = 18. What is the value of x when y = 72

Answer 1

So it looks like y is 2 times the square of x

so if y is 18 when x is 3

18/2 is 9 and the square root of 9 is 3

So when y is 72

72/2 is 36 and the square root of 36 is 6 so x = 6

Answer 2

thank you for helping me

Answer 3

not a problem