Problem
Choose all of the zeros of the function \( f(x)=2 x^{2}+9 x-5 \). 5 \( \square 1 \square \frac{1}{2} \) \( -\frac{1}{2} \) \( -5 \)
Solution
Step 1 ：\( f(x) = 2 x^{2}+9 x-5 \)
Step 2 ：\( x = \frac{-9 \pm \sqrt{9^2 - 4(2)(-5)}}{ 2(2) } \)
Step 3 ：\( x = -\frac{1}{2}, \frac{5}{2} \)
