Question

Select the approximate values of x that are solutions to f(x) = 0, where f(x) =- 8x2+5x+3.

I don't know if i did it correctly but my answer is (1.00,-0.38

Answer 1

Did you forget to follow these instructions?

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Answer 2

f(x) is a quadratic equation for which <i>exact</i> solutions may be obtained in many ways, including factoring, completing the square, and quadratic formula.

Are you studying numerical methods where an approximate solution is required instead of an exact one?

Yes, your answer is correct...to two decimal places. Usually multiple solutions are enclosed in braces to indicate that each number is part of a set of solutions, like {1, -3/8}.
(1.00, -0.38) would be an ordered pair.