Question

*Which of the following is the value of (√5 - √2)(√5 + √2)?*
1️⃣ √7
2️⃣ 2
3️⃣ 3
4️⃣ √21

Answer 1

Formula: a² - b² = (a + b) (a - b)

Answer: 3️⃣ 3

Answer 2

Answer:

3

Step-by-step explanation:

(a+b)(a-b)=a^2+b^2 (√5 - √2)(√5 + √2)=(√5)^2-(√2)^2= 5-2=3