There are several good websites to find help with radical equations. You tube has several good videos on radical equations that are free of charge.
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You plug the number back into the original equation. If you have a specific example, that would help.
radical equations have sq roots, cube roots etc. Quadratic equations have x2.
not me pls someone should help me
A "radical" equation is an equation in which at least one variable expression is stuck inside a radical, usually a square root. The "radical" in "radical equations" can be any root, whether a square root, a cube root, or some other root. Most of the examples in what follows use square roots as the radical, but (warning!) you should not be surprised to see an occasional cube root or fourth root in your homework or on a test.
Because someone wanted its square root.