I need the answer asap, will mark brainliest

What are the soultion(s) to the quadratic equation 40- x^2=0

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12

Julie begins counting backwards from 1000 by 2’s and at the same time tony begins counting forward from 100 by 3’s.   if they count at the same rate, what number will they say at the same time?