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Quadratics (1.1-1.3), the quadratic functions form, where, if we expand…
Quadratics (1.1-1.3)
Solving quadratic equation by
Factorisation
Find 2 numbers whose product is
ac
and sum is
b
helps to break an equation into simpler part
Completing the square
Rewrite a quadratic expression using only one occurrence of the variable
(
x+d)^2
and
(**x-d)^2
(x+d)^2=x^2+2dx+d^2
and
(x-d)^2=x^2-2dx+d^2
The quadratic formula
Use the formula
x= -b ± √b^2-4ac / 2a
If ax^2 + bx + c = 0
a, b
, and
c
are constants and
a
not equal to
0
y= ax^2 + bx + c
a
not eaqual with
0
Key feature
Degree=2
the quadratic functions form
where
if we expand the expression
we obtain the results