Posted by peter on Sunday, November 7, 2010 at 6:51am.
3x²+15x-33
a=3, so
=3(x²+5x-11)
=3[(x+2.5)²-11-2.5²]
=3[(x+2.5)²-(√(17.25))²]
=3(x+2.5+√(17.25))(x+2.5-√(17.25)))
So
x=-2.5±√(17.25)
which you can also express integers as follows:
x=[-5±√(69)]/2
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