Let A 1 → = 3 , A 2 → = 5 and A 1 → + A 2 → = 5 . The value of 2 A 1 → + 3 A 2 → ∙ 3 A 1 → - 2 A 2 → is:

Question

Let A 1 → = 3 , A 2 → = 5 and A 1 → + A 2 → = 5 . The value of 2 A 1 → + 3 A 2 → ∙ 3 A 1 → - 2 A 2 → is:, - 112.5, - 118.5, - 106.5, - 99.5

MARKS App · Accepted Answer

A → 1 + A → 2 = 5 A → 1 + A → 2 2 = 25 A → 1 2 + A → 2 2 + 2 A → 1 A → 2 = 25 9 + 25 + 2 A → 1 ∙ A → 2 = 25 A → 1 . A → 2 = - 9 2 Now, 2 A → 1 + 3 A → 2 ∙ 3 A → 1 - 2 A → 2 = 6 A → 1 2 - 4 A → 1 A → 2 + 9 A → 1 A → 2 - 6 A → 2 2 = 6 . A → 1 2 + 5 A → 1 A → 2 - 6 A → 2 2 = 6 × 9 + 5 - 9 2 - 6 × 25 = 54 - 45 2 - 150 = - 118.5

Search any question & find its solution

Looking for more such questions to practice?