Advertisements
Advertisements
प्रश्न
If `"r" - (1)/"r" = 4`; find: `"r"^2 + (1)/"r"^2`
योग
Advertisements
उत्तर
`("r" - 1/"r")^2`
= `"r"^2 + (1)/"r"^2 - 2`
⇒ (4)2 = `"r"^2 + (1)/"r"^2 - 2`
⇒ `"r"^2 + (1)/"r"^2`
= 16 + 2
= 18.
shaalaa.com
क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
APPEARS IN
संबंधित प्रश्न
Factorise the following:
64a3 – 27b3 – 144a2b + 108ab2
Simplify the following product:
(x2 + x − 2)(x2 − x + 2)
If a + b = 10 and ab = 21, find the value of a3 + b3
Find the following product:
(x3 + 1) (x6 − x3 + 1)
If a1/3 + b1/3 + c1/3 = 0, then
Use identities to evaluate : (101)2
If a - b = 0.9 and ab = 0.36; find:
(i) a + b
(ii) a2 - b2.
Use the direct method to evaluate :
(3b−1) (3b+1)
Evaluate: `(2"x"-3/5)(2"x"+3/5)`
Evaluate: 203 × 197
