7-BV T ¥ o~यदि 3) + 2कि 209 1 का मान ज्ञा

1.	7-BV T ¥ o~यदि 3) + 2कि 209 1 का मान ज्ञात की
Answer» 3x + 2y = 20 Xy = 14/9 27x^3 + 8y^3 =? Let us cube the first equation on both sides!. (3x + 2y)^3 = (20)^3 27x^3 + 8y^3 +{ 3(3x)(2y)}(3x + 2y)!. Formula = (a + b) ^3 = a^3 + b^3 + 3ab(a + b) 27x^3 + 8y^3 + 18xy(3x + 2y) 27x^3 + 8y^3 + 18(14/9)(20) 27x^3 + 8y^3 + 28(20) 27x^3 + 8y^3 + 560 = 800 27x^3 + 8y^3 = 800 - 560 27x^3 + 8y^3 = 240!.

7-BV T ¥ o~यदि 3) + 2कि 209 1 का मान ज्ञात की

Answer»

3x + 2y = 20

Xy = 14/9

27x^3 + 8y^3 =?

Let us cube the first equation on both sides!.

(3x + 2y)^3 = (20)^3

27x^3 + 8y^3 +{ 3(3x)(2y)}(3x + 2y)!.

Formula =

(a + b) ^3 = a^3 + b^3 + 3ab(a + b)

27x^3 + 8y^3 + 18xy(3x + 2y)

27x^3 + 8y^3 + 18(14/9)(20)

27x^3 + 8y^3 + 28(20)

27x^3 + 8y^3 + 560 = 800

27x^3 + 8y^3 = 800 - 560

27x^3 + 8y^3 = 240!.