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If |z1| = 4, |z2| = 3, then what is the value of |z1 + z2 + 3 + 4i|?(a) Less than 2(b) Less than 5(c) Less than 7(d) Less than 12I had been asked this question at a job interview.Question is from Quadratic Equations in portion Complex Numbers and Quadratic Equations of Mathematics – Class 11

Answer»

Correct option is (d) Less than 12

For EXPLANATION: As, we know | z1 + z2 + …….. +ZN| ≤ |z1| + |z2| + ………. + |zn|

So, |z1 + z2 + 3 + 4i| ≤ |z1| + |z2| + |3 + 4i|

Now, putting the given values in the equation, we GET,

=> |z1 + z2 + 3 + 4i| ≤ 4 + 3 + √(9 + 16)

=> |z1 + z2 + 3 + 4i| ≤ 4 + 3 + 5

=> |z1 + z2 + 3 + 4i| ≤ 12.



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