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Mathematics 13 Online
OpenStudy (anonymous):

x2−20x+99=0

OpenStudy (zzr0ck3r):

two numbers that multiply to 99 and add to -20?

OpenStudy (anonymous):

9,11

OpenStudy (zzr0ck3r):

does 9+11 = -20?

OpenStudy (zzr0ck3r):

-9 -11

OpenStudy (zzr0ck3r):

so we have (x-9)(x-11) = 0 so the answer is x=9,11

OpenStudy (amtran_bus):

The quadratic formula would work, too.

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