Question

please solve fast and right to get brainliest​

Answer 1

Answer:

0

Step-by-step explanation:

Given x + 5y = 10

On Cubing both sides, we get

⇒ (x + 5y)³ = 1000

⇒ (x)³ + (5y)³ + 3(x)(5y)² + 3(x)²(5y) = 1000

⇒ x³ + 125y³ + 75xy² + 15x²y = 1000

⇒ x³ + 125y³ + 15xy(x + 5y) = 1000

⇒ x³ + 125y³ + 15xy(10) = 1000

⇒ x³ + 125y³ + 150xy = 1000

⇒ x³ + 125y³ + 150xy - 1000 = 0

Hope it helps!

Answer 2

Answer:

0

Formula to use:

${(a+b)}^{3}={a}^{3}+{b}^{3}+ 3ab (a+b)$

Explanation:

x+5y = 10...........(1)

Cubing on both sides

${(x + 5y)}^{3} = {10}^{3}$

${x}^{3} + {(5y)}^{3} + 3( x )( 5y)(x + 5y) = 1000$

${x}^{3} + 125 {y}^{3} + 15xy(10) = 1000$ (from eqn 1)

${x}^{3} + 125 {y}^{3} + 150xy= 1000$

${x}^{3} + 125 {y}^{3} + 150xy - 1000 = 0$