SOLUTION: please check this for me? 7x^2+18-9 x=-b+-sqrt{{{b^2-4ac}}}/2a x=-18+-sqrt{{{18^2+4*7*9}}}/2*7 x=(-18+24)/2*7 x=6/14=3/7 x=-42/14=-3 x=-3,7

SOLUTION: please check this for me? 7x^2+18-9 x=-b+-sqrt{{{b^2-4ac}}}/2a x=-18+-sqrt{{{18^2+479}}}/27 x=(-18+24)/27 x=6/14=3/7 x=-42/14=-3 x=-3,7

Question 81337: please check this for me?
7x^2+18-9
x=-b+-sqrt/2a
x=-18+-sqrt/2*7
x=(-18+24)/2*7
x=6/14=3/7
x=-42/14=-3
x=-3,7
Answer by vertciel(183) (Show Source): You can put this solution on YOUR website!
Hello there,
x = 3/7 and x = -3 is correct.
You actually could have solved this question more easily, by factoring the quadratic:
(7x - 3)(x + 3)
Now you can see that x MUST be x = 3/7 and x = - 3.
Also, you could have graphed this quadratic with your calculator to see if your x -intercepts are right.
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