Advertisements
Advertisements
प्रश्न
If `"a"^2 - 7"a" + 1` = 0 and a = ≠ 0, find :
`"a"^2 + (1)/"a"^2`
योग
Advertisements
उत्तर
`"a" + (1)/"a"` = 7
⇒ `"a"^2 + (1)/"a"^2 + 2`
= 49
⇒ `"a"^2 + (1)/"a"^2`
= 49 - 2
= 47.
shaalaa.com
क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
APPEARS IN
संबंधित प्रश्न
Factorise the following:
8a3 + b3 + 12a2b + 6ab2
Simplify the following product:
(x2 + x − 2)(x2 − x + 2)
Write in the expanded form:
`(a + 2b + c)^2`
If \[x^3 - \frac{1}{x^3} = 14\],then \[x - \frac{1}{x} =\]
Use the direct method to evaluate :
(3x2+5y2) (3x2−5y2)
Use the direct method to evaluate :
(0.5−2a) (0.5+2a)
Expand the following:
(m + 8) (m - 7)
Expand the following:
(x - 5) (x - 4)
If `"a"^2 + (1)/"a"^2 = 14`; find the value of `"a" + (1)/"a"`
The value of 2492 – 2482 is ______.
