Question

if X= ( 2+√ 5)^1/2 +(2-√ 5)^1/2 Y =(2+√ 5)^1/2 -(2-√5)^1/2 Then find X^2 +Y^2 find the value of a and b if x^2+y^2-xy=a+b√ 5

Answer 1

Step-by-step explanation:

Babies' teeth begin to develop before they are born, but in most cases don't come through until they're between 6 and 12 months old. Most children have a full set of 20 milk or baby teeth by the time they're 3 years old. When they reach 5 or 6, these teeth will start to fall out, making way for adult teeth.

Answer 2

Answer:

x=(2+5–√)12+(2−5–√)12=2+5–√−−−−−−√+2−5–√−−−−−−√

⟹x2=2+5–√+2⋅(2+5–√)⋅(2−5–√)−−−−−−−−−−−−−−−√+2−5–√

⟹x2=4+2⋅4–5−−−√=4+2i

y=(2+5–√)12−(2−5–√)12=2+5–√−−−−−−√−2−5–√−−−−−−√

⟹y2=2+5–√−2⋅(2+5–√)⋅(2−5–√)−−−−−−−−−−−−−−−√+2−5–√

⟹y2=4−2⋅4–5−−−√=4−2i

∴ x2+y2=4+2i+4−2i=8