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CBSE Class 10 Answered

If the difference of the roots of the quadratic equation x2 – ax + b is 1, then a2 – 4b = 0 a2 – 4b = -1 a2 – 4b = 1 a2 – 4b = 4
Asked by miniprasad | 21 Sep, 2018, 06:22: PM
answered-by-expert Expert Answer
x2 – ax + b = 0
Let x1 and x2 be the roots of the quadratic equation.
x1 + x2 = a and x1x2 = b
According to the question,
x1 - x2 = 1
Using
(x1 - x2)2 = (x1 + x2)2 - 4x1x2
we get 
a2 - 4b = 1
Answered by Sneha shidid | 25 Sep, 2018, 10:06: AM

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