Question

the sum of the roots of one of the following equation is 3 which one is the equation ? A) x2 - 3x + 2 =0 B) x2 + 3x + 2 = 0 C) 3x2 + 6x +10 = 0 D) x2 + 3x - 2 = 0​

Answer 1

Answer:

A) IS THE ANSWER

Step-by-step explanation:

AS ALPHA+BETA IS. -b/a...

so

b = -3 AND a= 1

SO - AND - =. +

SO ANSWER IS 5

HOPE IT HELPS YOU

Answer 2

Answer:

A)

Step-by-step explanation:

we know that in an equation of the form

$a {x}^{2} + bx + c$

the term 'b' is the summation of the roots. So we have to check for which equation is 3 the summation of roots.

factorisation of the first equation

${x}^{2} - 3x + 2 = 0 \\ {x}^{2} - x - 2x + 2 = 0 \\ x(x - 1) - 2(x - 1) = 0 \\ (x - 1)(x - 2) = 0 \\ x = 1 \: or \:x = 2$

Adding the two roots, we get 3. Hence A is the correct option