If a = and b = find the value of a 2 + b 2 – 5 ab .

Step-by-step solution

Given a = Squaring both sides, we get Also, given On solving in a similar way, we get b 2 = 49 + and ab = a 2 + b 2 – 5 ab = 49 − + 49 + – 5 × 1 = 98 – 5 = 93