Question

Is ( 2+ root 5 ) ( 2+ root 5 ) is rational or irrational.

Answer 1

Answer:

IT IS IRRATIONAL.

Step-by-step is explanation:

→ (2+√5)(2+√5)

→ IDENTITY USED = (A+B)(C+D)= AC+AD+BC+BD

→ 2*2+2*√5+√5*2+√5*√5

→ 4+2√5+2√5+√25

→ 4+2√5+2√5 + 5

→ 4+5+2√5+2√5

→ 9+2√5+2√5

→ 9+4√5