Advertisements
Advertisements
प्रश्न
If a + b = 8 and ab = 15, find a3 + b3.
बेरीज
Advertisements
उत्तर
Here, a + b = 8, ab = 15
Using the identity,
a3 + b3 = (a + b)3 − 3ab (a + b)
= (8)3 − 3(15)(8)
= 512 − 3(120)
= 512 − 360
∴ a3 + b3 = 152
shaalaa.com
Application of Formulae
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 3: Expansions - EXERCISE B [पृष्ठ ३५]
संबंधित प्रश्न
If a+b=5 and ab = 6, find a2 + b2
If a2 + b2= 10 and ab = 3; find : a + b
If `"a"^2+ 1/"a"^2=23`, find : `"a" +1/"a"`
If `"a"^2+ 1/"a"^2=11`, find : `"a" -1/"a"`
Find: a2 + b2 + c2, if a + b + c = 9 and ab + bc + ca = 24
Find : `"a"^3+1/"a"^3`, if `"a" +1/"a"=5`.
If `3"x"+1/(3"x")=3`, find : `27"x"^3+1/(27"x"^3)`
If a2 + b2 = 41 and ab = 4, find : a – b
If a + b + c = 9 and ab + bc + ca = 15, find: a2 + b2 + c2.
If 3x – 4y = 5 and xy = 3, find : 27x3 – 64y3.
