b2 = aV + 2cr
b2 = ar + 2c2r
b2 = a2 = 12 cr2
b2 = 12ar2 + c
b2 = 2cr - a2
Correct answer is E
b = a + cp....(i)
r = ab + 12cp2.....(ii)
expressing b2 in terms of a, c, r, we shall first eliminate p which should not appear in our answer from eqn, (i)
b - a = cp = b−ac
sub. for p in eqn.(ii)
r = ab + 12c(b−a)2ab+b2−2ab+a22c
2cr = 2ab + b2 - 2ab + a2
b2 = 2cr - a2
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