When you square each side of an equation, do you always get an equivalent equation?

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle

Find the solution to this system 2,1 1,-2 1,2 -1,2