Answers

2014-07-14T18:53:39+08:00
In the equation ax²+bx+c, 
we can factor out it by thinking of two numbers when multiplied is equal to c and the sum is equal to b
e.g. x²+2x-3
(x+     )(x+    )
3 and -1
3+(-1)=2(right)
3×(-1)=3(right)
therefore the factors are (x+3) and (x-1)

note: there are a lot of ways to factor out a quadratic equation like completing the square, sum/diff of two squares and etc....


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