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Quadratic (Completing Square Method (Find the missing term of a perfect…
Quadratic
Completing Square Method
Find the missing term of a perfect square in the expression
Factorize the completed square
x^2+4x+15
(x^2+4x+4)-4+15
Plus and minus the completed term so that the expression stays the same
The solution is good for graphing
Work for all quadratic equations
Solving
To find the x-intercept, substitute 0 into y
For example
x(x+2)
0=x(x+2)
x=0
x=-2
Factorising
Factorising by using cross method
ax^2+bx+c=0
Find factors of c which adds up and equals to b
For example
0=b^2+b-2
Factors of -2 which adds up to 1
2, -1
(x+2)(x-1)
1 more item...
Graphing