Suppose -1 is a root of the quadratic equation 15x^2-x+c=0. Find the other root of the equation without finding the value of c.
急問!! 謝解答

sum of roots等如咩呀?
知道就會計到:)

This question is rather straight forward. Just memorize the definition of sum of roots and product of roots(this question is not required) , then you can find out the answer.

Phenolphthalein :This question is rather straight forward. Just memorize the definition of sum of roots and product of roots(this question is not required) , then you can find out the answer.

sum of root(-b/a) = x/15
product of root(c/a) = c/15
then how to caculate it? I lost my way here Would you mind telling me the soulution please?

JN568@80K :

Phenolphthalein :This question is rather straight forward. Just memorize the definition of sum of roots and product of roots(this question is not required) , then you can find out the answer.

sum of root(-b/a) = x/15
product of root(c/a) = c/15
then how to caculate it? I lost my way here Would you mind telling me the soulution please?

For a quadratic equation ax^2+bx+c=0
Sum of roots = -b/a

Sum of roots = -(-1/15) = 1/15
but not x/15

JY4066 :

JN568@80K :

Phenolphthalein :This question is rather straight forward. Just memorize the definition of sum of roots and product of roots(this question is not required) , then you can find out the answer.

sum of root(-b/a) = x/15
product of root(c/a) = c/15
then how to caculate it? I lost my way here Would you mind telling me the soulution please?

For a quadratic equation ax^2+bx+c=0
Sum of roots = -b/a

Sum of roots = -(-1/15) = 1/15
but not x/15

ya,sorry for mis-caculation
can u tell me the solution plz??

JN568@80K :

JY4066 :

JN568@80K :

Phenolphthalein :This question is rather straight forward. Just memorize the definition of sum of roots and product of roots(this question is not required) , then you can find out the answer.

sum of root(-b/a) = x/15
product of root(c/a) = c/15
then how to caculate it? I lost my way here Would you mind telling me the soulution please?

For a quadratic equation ax^2+bx+c=0
Sum of roots = -b/a

Sum of roots = -(-1/15) = 1/15
but not x/15

ya,sorry for mis-caculation
can u tell me the solution plz??

......

：隱藏內容，按一下這裏顯示

Sum of roots = 1/15
Sum of roots = -1 + the other root

所以
-1 + (the other root) = 1/15
the other root = ?


好直接