Thursday, May 9, 2013

what is the number of real solutions in -x^2+9x+7=0


We can use the discriminant to determine the number and type of solutions: 


%0D%0A+sqrt%28+9%5E2-4%2A%28-1%29%2A7+%29=sqrt%28109%29%0D%0A


since the discriminant is real and not 0 we know that there are 2 real solutions

:)
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