a=2-5^1\2÷(2+5^1\2) b=2+5^1 \2 ÷(2-5^1\2) find (a+b) ^3 class 9 maths pk garg pg 9 question 41
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a=2-√5/2+√5
a=(2-√5)(2-√5) /(2+√5) (2-√5)
a=4 - 4√5 +5/ 4 - 5
a= 9- 4√5/ -1
a=4√5-9
______________________________
b=2+√5/2-√5
b=(2+√5) (2+√5) /(2-√5) (2+√5)
b=4+4√5+5/4-5
b=9+4√5/-1
b=-9-4√5
______________________________
(a+b) ^3=(4√5-9-9-4√5) ^3
=(-18) ^3
=-5832
______________________________
a=(2-√5)(2-√5) /(2+√5) (2-√5)
a=4 - 4√5 +5/ 4 - 5
a= 9- 4√5/ -1
a=4√5-9
______________________________
b=2+√5/2-√5
b=(2+√5) (2+√5) /(2-√5) (2+√5)
b=4+4√5+5/4-5
b=9+4√5/-1
b=-9-4√5
______________________________
(a+b) ^3=(4√5-9-9-4√5) ^3
=(-18) ^3
=-5832
______________________________
Thatsomeone:
thanks for selecting my answer as brainliest
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