Question

If one root of the equation 2x² + ax + 6 = 0 is 2 then a = ?

विकल्प

• 7

• –7

• `7/2`

• `(-7)/2`

Answer 1

–7

Explanation: 

It is given that one root of the equation 2x² + ax + 6 = 0 is 2 

∴ 2 × 2² + a × 2 + 6 = 0 

⇒ 2a + 14 = 0 

⇒ a = –7