Chapter 3: Equations

1. PlySmlt 2 Root Finder

2. Exact answers
Factorisation
OR
Manually (formula)

3. D = b^2 - 4ac
D>0, 2 distinct roots
D=0, equal or repeated roots
D<0, no real root

4. ax^2 + bx + c always +ve
when a>0, D<0, curve above x axis

ax^2 + bx + c always -ve
when a<0, D>0, curve below x axis

OR

always +ve or -ve, complete square

a^2 can be smaller or equal to 0