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Select the approximate values of x that are solutions to f(x)=0, where f(x)=-6x^2+8x+9

Select the approximate values of x that are solutions to f(x)=0, where f(x)=-6x2+8x+9.
 
A. {2.06, -0.73}
B. {-6, 8}
C. {-1.33, -1.50}
D. {-0.67, 0.89}
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2 Answers

I agree 100 % with the solution and answer given by Parviz from CA.
 
 
f(x ) = -6X^2 + 8X + 9
 
   x = -8/-12 ±√(64- 4(-6)(9)) / -12= 
 
         2/3 ±16.73/12 =
 
      (-0.73 ,206)