Advertisements
Advertisements
प्रश्न
If `3"x"-1/(3"x")=5`, find : `81"x"^4+1/(81"x"^4)`
योग
Advertisements
उत्तर
`81"x"^4+1/(81"x"^4)=(9"x"^2+1/(9"x"^2))^2-2`
= (27)2 − 2
= 729 − 2
= 727
shaalaa.com
Important Formula of Expansion
क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
APPEARS IN
संबंधित प्रश्न
Expand : `(2"a"-1/"a")^2`
Expand : (a−b+c)2
Find the square of `"5a"/"6b"-"6b"/"5a"`
Find the square of `8"x"+3/2"y"`
If `"a" +1/"a"=2`, find : `"a"^2+1/"a"^2`
If `"m" -1/"m"=5`, find: `"m"^4+1/"m"^4`
If a2 + b2 = 41 and ab = 4, find : a + b
If `2"a"+1/(2"a")=8`, find : `16"a"^4+1/(16"a"^4)`
Expand : (3x – 4y + 5z)2
Expand : (2a – 5b – 4c)2
