Question

The sum of the roots of 3x^2 +11x-4=0 is

Answer 1

a) -11/3
b) 11/3
c) -4/3
d) 4/3

Answer 2

Suppose the roots are a and b

Answer 3

Then we can factor the quadratic as

3x^2 +11x-4 = 3(x-a)(x-b)

Answer 4

Same as

3x^2 +11x-4 = 3[x^2 - (a+b)x +ab]

Answer 5

?

Answer 6

comparing x coefficients both sides gives

11 = -3(a+b)

Answer 7

You must know what to do next to get the sum of roots a+b

Answer 8

no i never paid attetion in math

Answer 9

Its never too late for learning anything

Answer 10

can you teach me what to do

Answer 11

It will be easy if you take time to understand the question I was asking

Answer 12

still confussed

Answer 13

11 = -3(a+b)

Can you tell me what I was asking you to do after this step ?

Answer 14

Your goal is a+b,
so simply divide -3 both sides and get

-11/3 = a+b

Answer 15

so its -11/3?

Answer 16

Yes. If I may give a piece of advice. It can be confusing, but it will make sense if you persist and fi a few more practice problems. Don't simply give up just because youve felt it confusing the first time!