Find the 20

Find the product and the sum of the roots of x2 + 3x - 9 = 0

Correct answer:

p =  -9
s =  -3

Step-by-step explanation:

x2 + 3x − 9 = 0 a=1 b=3 c=−9  p=c/a=(−9)/1=−9
s=−b/a=−3/1=−3   Verifying Solution:  x2+3x−9=0  x2+3x−9=0  a=1;b=3;c=−9 D=b2−4ac=32−4⋅1⋅(−9)=45 D>0  x1,2​=2a−b±D​​=2−3±45​​=2−3±35​​ x1,2​=−1.5±3.354102 x1​=1.854101966 x2​=−4.854101966  p1​=x1​⋅ x2​=1.8541⋅ (−4.8541)=−9 s1​=x1​+x2​=1.8541+(−4.8541)=−3

Our quadratic equation calculator calculates it.


Try another example


Did you find an error or inaccuracy? Feel free to write us. Thank you!







Tips for related online calculators
Are you looking for help with calculating roots of a quadratic equation?

You need to know the following knowledge to solve this word math problem:

Grade of the word problem:

Related math problems and questions: