Me. solve using the quadratic formula. 5x2+x+3=0

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- B ± √ B2-4AC
x = ————————
2A

In our case, A = 5
B = 1
C = 3

B2 - 4AC =
1 - 60 =
-59

Applying the quadratic formula :

-1 ± √ -59
x = ——————
10

But we can't square root a negative number. When you square a number, whether it's a negative, or a positive, you'll always get a positive integer. That's why you can't square root a negative. Please check if you've copied out the question right, so we can help you accordingly.