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ax² + bx + c = 0
standard form of a quadratic equation
y = a(x - h)² + k
vertex form of a quadratic equation
h = -b/2a
x-coord of the vertex of a quadratic equation when given part of the standard form
h = (x1 + x2)/2
x-coord of the vertex of a quadratic equation when x-coords of two solutions are known
x1 + x2 = -b/a
shortcut to use whenever asked for the sum of two solutions to a quadratic equation
x1 * x2 = c/a
shortcut to use whenever asked for the product of two solutions to a quadratic equation
(x - h)² + (y - k)² = r²
formula for a circle