Answers

2014-06-10T14:00:39+08:00
X^2+4x+16=0 is an example of quadratic eq.
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2014-06-10T18:35:20+08:00
Any equations that is written in the standarm form :
a x^{2} +bx+c=0 where a,b,c are real numbers and a \neq 0.
Examples:

3 x^{2} +5x+30=0

3x(x+5)=10
Solution:
3 x^{2} +15x=10
3 x^{2} +15x-10=0

(x+1)^{2}=15
Solution:
x^{2} +2x+1-15=0
 x^{2} +2x-14=0
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