Question

class XI Maths Chapter 1
revision question 6​

Answer 1

Answer:

answer is 8 this a option

b option 7by2

Answer 2

Answer:

(a) √3(√3 + √2) = 3 + √6

(c) (√5 + 2)² = 9 + 4√5

Step-by-step explanation:

Before solving we must know certain important results,

(√x) × (√y) = (√xy)

(√x)² = x

√x × √x = (√x)²

Now, we have,

(a)

√3(√3 + √2)

Using Distributive Property,

[√3 × √3] + [√3 × √2]

(√3)² + [√(3 × 2)]

From above results,

= 3 + √6

Hence,

√3(√3 + √2) = 3 + √6

(c)

(√5 + 2)²

Using the identity,

(a + b)² = a² + 2ab + b²

(√5 + 2)² = (√5)² + 2(√5)(2) + 2²

= 5 + 4√5 + 4

= 9 + 4√5

Hence,

(√5 + 2)² = 9 + 4√5

Hope it helped and believing you understood it........All the best