engineering recuitment NFC Chemical Plant Operator Mock Test Mathematics Quadratic Equations

If the difference between the roots of ax2 + bx + c = 0 is 1, then which one of the following is correct?

1
b2 = a(a + 4c)
2
a2 = b(b + 4c)
3
a2 = c(a + 4c)
4
b2 = a(b + 4c)
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