S2 - 2
S + 2
S - 2
S2 + 2
Correct answer is B
S = √t2−4t+4
S2 = t2 - 4t + 4
t2 - 4t + 4 - S2 = 0
Using t=−b±√b2−4ac2a
Substituting, we have;
Using t=−(−4)±√(−4)2−4(1)(4−S2)2(1)
t=4±√16−4(4−S2)2
t=4±√16−16+4S22
t=4±√4S22
t=2(2±S)2
Hence t = 2 + S or t = 2 - S
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