Find the roots of the equations by quadratic formula: 2x2 + x + 4 = 0
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ANSWER
2x
2
+x−4=0
Compairing with ax
2
+bx+c=0
a = 2 b = 1 c = -4
∴
2a
−b±
b
2
−4ac
=
2×2
−1±
1
2
−4×2(−4)
4
−1±
33
∴x=
4
−1+
33
OR x=
4
−1−
33
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