If a + b = 24          where a > b a2 + b2 = 306 Find 4a - 5b

30 45 20 15

15

Formula → (a + b)2 = a2 + b2 + 2ab 576 = 306 + 2ab ab = 135 ab = 15 × 9 a = 15 b = 9 Now; we have to find 4a - 5b 4 × 15 - 5 × 9 = 15