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Standard form of a quadratic equation
y = ax² + bx + c
Sum of the solutions of a quadratic equation
-b/a
Product of the solutions of a quadratic equation
c/a
Factored form of a quadratic equation
y = a(x - b)(x - c)
Vertex form of a quadratic equation
y = a(x - h)² + k
“h” value of a quadratic function in vertex form
h = -b/2a
Special factoring rules
(x + a)² = x² + 2ax + a²
(x - a)² = x² - 2ax + a²
(x + a)(x - a) = x² - a²
Quadratic formula
x = (-b ± √(b² - 4ac))/2a
Discriminant of a quadratic equation
√(b² - 4ac)
Standard form of a polynomial
y = axn-1 + bxn-2 + cxn-3… + d
Height versus time
h(t) = -at² + bt + c
Population growth/decline
P(t) = P0rt
Compounding interest
P(t) = P0(1 + r)t