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how to solve binomial expansion (a+b)(c+d)
ac + ad + bc + bd
x²-9
x²-3²
(x+3)(x-3)
how to solve (a+b)² or (a-b)²
a²+2ab+b² or a²-2ab+b²
how to solve monic quadratics
find 2 numbers (lets say x &y) which multiply to c and add to b
format as (a+/-x)(a+/-y)
how to solve non-monic quadratics
find 2 numbers (lets say x & y) which multiply to c x coefficient of a and add up to b
then divide whole thing by coefficient of a, factorise one of the parts and cancel out