Grade 99 grade maths
If x= 2-√5/2+√5 and y= 2+√5/2-√5, find the value of (x*x)-(y*y)
1 Answer
Arun
Dear student
x = 2-√5/2+√5
on rationalization
x = (4 + 5 – 4 √5) / – 1
x = 4 √5 – 9
Now similarly y = – 4 √5 – 9
Now question is asked for x^2 – y^2
= (x+y) * (x – y)
= – 18 * 8 √5
= – 144√5
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