Question

the number is
$(3 - \sqrt{7})(3 + \sqrt{7}$
a. rattional no. b.an irrtional no.
c.natural no. d.both a and c​

Answer 1

$(3-\sqrt{7})(3+\sqrt{7})\\ = (3-\sqrt{7})^2\\ = 9 - 7\\ = 2$

d. both a & c .

Answer 2

Answer:

❥ (d) Both a and c ✅

Step-by-step explanation:

• $(3 - \sqrt{7}) (3 + \sqrt{7})$

Use formula :-

➵ ( a + b) ( a - b) = a² - b²

• (3) ² - (√7) ²
• 9 - 7
• 2

→ "2" is a rational number and also a natural number.