The quadratic formula is: x = −b ± √b2 − 4ac 2a x = - b ± b 2 - 4 a c 2 a You can use this formula to solve quadratic equations. Or, if your equation factored, then you can use the quadratic formula to test if your solutions of the quadratic
Only if it can be put in the form ax2 + bx + c = 0, and a is not zero. The name comes from quad meaning square, as the variable is squared (in other words x2 ). These are all quadratic
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