Question

10 no. question and 11th ka 2nd part solution plzzzz. ​

Answer 1

Solution 10) :-

Equation 2x+ky = 9 passes through (-1,-1)

So,

→ 2(-1) + k(-1) = 9

→ -2 - k = 9

→ k = - 2 - 9

→ k = (-11) (Ans.)

Solution 11. b) :-

→ (x + 1)² - (y - 1)²

using :-

• (a + b)² = a² + b² + 2ab
• (a - b)² = a² + b² - 2ab

→ (x² + 2x + 1) - (y² - 2y + 1)

→ x² - y² + 2x + 2y + 1 - 1

→ (x² - y²) + 2(x + y)

using :-

• (a² - b²) = (a + b)(a - b)

→ (x + y)(x-y) + 2(x+y)

→ (x+y)(x - y + 2) (Ans.)