Question
If a + b + c = 14 and ab + bc + ca = 60, then find the
value of a² + b² + c².Solution
Since, (a + b + c) ² = a² + b² + c² + 2 (ab + bc + ca) So, a² + b² + c² = (14)² – 2 x 60
= 196 - 120 = 76
If the third proportion of 8 and 16 is “0.5k”, then find the value of (k − 4) : (k + 14).
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