Find all real values of t that satisfy the equation t^2 = 324. If you find more than one, then list your values in increasing order, separated by commas.
t^2=324
Take the square root of both sides
t = +/- 18
t = -18, 18
We know that t2=324, so we can solve for, t which is 18, and t can also be equal to -18, because any negative number squared, will be positive!