Maths Dictionary · SS 1
Quadratic equation
Simple meaning
An equation where the highest power of x is 2. It can have up to two solutions.
Example
x2 − 5x + 6 = 0 has solutions x = 2 and x = 3.
See it
From the Quadratic Equations by Factorisation lesson. Try moving things around.
y = x2 − x − 6
x2 − x − 6 = (x + 2)(x − 3)
Roots: x = −2 or x = 3
Check: −2 + 3 = 1 (that's −b) and −2 × 3 = −6 (that's c)
b (the x number)−1
c (the number)−6