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what do you mean not allowed!?
That's the easiest way in general, because it's guaranteed to work, you're just plugging into a formula every time. But this question asked you to factorise, so that method wouldn't be allowed.
Another easy way is to use determinant(det) b^2  4ac
In my opinion the best way is to write the coefficient of x^2 in front of the brackets and then factorise expression in the brackets using completing the square or other method). I prefer completting the square as it always work very well and you do not have to wast your time for finding e * f = c etc. Work well with any question of factorizing quadratics, especially when you have to deal with questions such as 6a^2  23ab + 20b^2
Here's another questionwhen the
Here is it:
I'll try something...
Merry Christmas Ricky and krazzi!
I'm still having a little trouble with this.
The picture of yours that I see has the hat on! Are you trying to change it back to your normal one?
Merry Christmas Ricky and Mathsy!
Merry Christmas Krassi and Mathsy
Yes, your method is truely better in a ways.
(what is the word for taking divisor out of brackets) > factorise
Yes. It must work. 