5x² – 4x– 60 =0 than x =?
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Here, a = 5
b = –4
c = –60
From Sridharacharya's rule, we have :
D = b² – 4ac
D = (–4)² – 4×5×(–60)
D = 16 + 1200
D = 1216
x = –b±√D/2a
x = –(–4)±√1216/2×5
= 4 + 34.87/10 or 4 – 34.87/10
= 38.87/10 or –30.87/10
Thus, x = 3.887 ≈ 3.9 or x = 3.087 ≈ 3.1
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