Question

please show with all workings​

Answer 1

$\LARGE{\underline{\underline{\sf{Answer:-}}}}$

• x = 120°
• 2x² - 4x = 6

$\LARGE{\underline{\underline{\sf{Step-by-step \: explanation:-}}}}$

Q 11. The sum of two angles of a triangle is 60° . Find the third angle.

➝ Let the third angle be x

➝ x + 60° = 180° [ the sum of all angles of a triangle is 180° ]

➝ x = 60° - 180°

➝ x = 120°

let's verify this !

60° + 120 = 180°

180° = 180°

LHS = RHS

hence , verified

___________________

Q 12. If x = 3 , then find the value of 2x² - 4x

➝ if x = 3

➝ 2x² - 4x

➝ 2(3)² - 4 × 3

➝ 2 × 9 - 12

➝ 18 - 12 = 6

So , the value of 2x² - 4x is = 6

Now let's verify this too !

2x² - 4x is = 6

2(3)² - 4 × 3 = 6

2 × 9 - 12

2 × 9 - 1218 - 12 = 6

6 = 6

hence , verified