Advertisements
Advertisements
प्रश्न
If 3x + 2y = 9 and xy = 3, find : 27x3 + 8y3.
बेरीज
उत्तर
27x3 + 8y3 = (3x)3 + (2y)3
= (3x + 2y)3 − 3.3x . 2y (3x + 2y)
= (3x − 2y)3 − 18xy (3x + 2y)
= (9)3 − 18(3) (9)
= 729 − 486
= 243
shaalaa.com
Application of Formulae
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
APPEARS IN
संबंधित प्रश्न
If a2 + b2 = 29 and ab = 10, find : a − b
If a2 + b2= 10 and ab = 3; find : a – b
If a2 + b2= 10 and ab = 3; find : a + b
If `"a" + 1/"a"=3`, find `"a"^2+1/"a"^2`
If a + b + c = 10 and a2 + b2 + c2 = 38, find : ab + bc + ca
Find : `"a"^3+1/"a"^3`, if `"a" +1/"a"=5`.
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 3x – 4y = 5 and xy = 3, find : 27x3 – 64y3.
If 5x – 4y = 7 and xy = 8, find : 125x3 – 64y3.
