Question

The quadratic equation x2 + mx + q = 0, where m and q are real numbers, has the complex root a + bi. Which of the following must be equal to m?

A.2a

B.−2a

C.2b

D.−2

Answer 1

it's A or B

Answer 2

@Aimee98 do you know this

Answer 3

If α and ß are roots of 1x² + mx + q = 0,

then, by Vieta's Formulae,

α + ß = -m ........................................... (1)
______________________________

If one root is α = a + bi,

then the other root is ß = a - bi.

Hence, from (1),

( a + bi ) + ( a - bi ) = -m

2a = -m

m = -2a ........................................... Ans.

Answer 4

B. −2a

Answer 5

thanks