Advertisements
Advertisements
प्रश्न
If a2 + b2= 10 and ab = 3; find : a + b
योग
Advertisements
उत्तर
(a + b)2 = a2 + b2 + 2ab
⇒ (a + b)2 = 10 + 2×3
⇒ (a + b)2 = 10 + 6
⇒ (a + b)2 = 16
⇒ (a + b) = `sqrt16`
⇒ a + b = ±4
shaalaa.com
Application of Formulae
क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
APPEARS IN
संबंधित प्रश्न
If a – b = 6 and ab = 16, find a2 + b2
If a2 + b2= 10 and ab = 3; find : a – b
If a + b + c = 10 and a2 + b2 + c2 = 38, find : ab + bc + ca
If a + b = 6 and ab = 8, find: a3 + b3.
If a – b = 3 and ab = 10, find : a3 – b3.
Find:
`a^3-1/a^3`, if `a -1/a = 4`.
If `3"x"+1/(3"x")=3`, find : `27"x"^3+1/(27"x"^3)`
If a + b + c = 9 and ab + bc + ca = 15, find: a2 + b2 + c2.
If a + b + c = 11 and a2 + b2 + c2 = 81, find : ab + bc + ca.
If 5x – 4y = 7 and xy = 8, find : 125x3 – 64y3.
