Math powerpoint
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The quadratic formula is used to find the x-intercepts of a quadratic equation that cannot be factored. It is in the form x = (-b ± √(b2 - 4ac)) / 2a, where a, b, and c are the coefficients of the quadratic equation. You substitute the coefficients for a, b, and c, simplify within the radical, and solve the equation twice - once with addition in the radical and once with subtraction - to find the two x-intercepts.
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Math powerpoint
- 1. Quadratic FormulaBy: Austyn Coy
- 2. What it is used for…The Quadratic Formula is used to find an x- intercept if an equation won’t factor. Like this example.X^2 +3x-2-2x^2 and 3x does no factor. Use the Quadratic Formulax= -b ± √b^2 – 4ac 2a
- 3. How to use it. An example of an equation is x^2+ 3x-2.To use the quadratic formula you have to figure out what the A, B, and C are.A is the coefficient in front of x^2. (1)B is the coefficient in front of x. (3)C is the lone number. (-2)
- 4. SubstitutionTo use the quadratic formula you have to substitute the A,, B, and C in. Once you have done that you use the order of operations to solve what is inside. x^2 + 3x – 2X= -3 ± √3^2 – 4(1)(-2)x=-3 ± √17 2(1) 2
- 5. To solve the rest of the equationWhen you simplify the equation as much as you can, then plug it into your calculator twice. Once doing addition and the next time doing subtraction. Make sure that you put a parenthesis around the radical. X= -3 + √17) x= -3 - √17) 2 2Doing this will give you your 2 x- intercepts.