Explanation
Here D = 1 which is a perfect square. Hence its roots are rational.
D = 0 Hence roots are equal. But as b is irrational. Hence roots are irrational and equal.
Accordingly, p2 =144 ⇒ |p| = 12.
Obviously roots will be equal in magnitude but opposite in sign if coefficient of x = 0. But he equation is x2 + 2mx + m2 – ab = 0
∴ m = 0
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