Question

If x = –1 is a root of the equation ax² – bx + 3 = 0, then:

विकल्प

• – a + b – 3 = 0

• a – b – 3 = 0

• – a – b + 3 = 0

• a + b + 3 = 0

Answer 1

a + b + 3 = 0

Explanation:

If x = –1 is a root,

Substitute into the equation: 

a(–1)² – b(–1) + 3 = 0 

⇒ a + b + 3 = 0