Question

Given A = `[(4, 7),(3, -2)]` and B = `[(1, 2),(-1, 4)]`, then A – 2B is ______.

विकल्प

• `[(-2, 3),(5, -10)]`

• `[(-2, -3),(-5, 10)]`

• `[(2, 3),(5, -10)]`

• `[(2, 3),(5, 10)]`

Answer 1

Given A = `[(4, 7),(3, -2)]` and B = `[(1, 2),(-1, 4)]`, then A – 2B is `underlinebb([(2, 3),(5, -10)])`.

Explanation:

Given

A – 2B = `[(4, 7),(3, -2)] - 2[(1, 2),(-1, 4)]`

= `[(4, 7),(+3, -2)] - [(2, 4),(-2, 8)]`

= `[(4 - 2, 7 - 4),(3 + 2, -2 - 8)]`

= `[(2, 3),(5, -10)]`