if the answer of the sum for some quadratic polynomial is 2/3 can it be written as -(-2)/3 as it is mentioned to be -b/a (can we write like this in the exams if its correct)
Asked by ravikaartik
| 11th Jun, 2015,
05:35: PM
Expert Answer:
For a quadratic equation ax2+bx+c=0, the sum of the roots is -b/a
So the final result of sum depends on the sign of 'a' and 'b'.
For example, if the quadratic equation is 2x2+3x+5=0, the sum of the roots is -3/2. (negative)
if the quadratic equation is 2x2-3x+5=0, the sum of the roots is -(-3)/2= 3/2. (positive)
So, the sum of the roots depend on the signs of 'a' and 'b'.
But if the result is 2/3, you dont have to write it as -(-2)/3. Simply divide 'b' by 'a' and put a negative sign. That gives you the sum of the roots of any quadratic.
Hope this helps.
Answered by satyajit samal
| 12th Jun, 2015,
09:30: AM
Application Videos
Concept Videos
- answer this question
- The sum of two numbers is 80. The larger number exceeds the smaller number by 4. If the smaller number is'y'and larger number is'x'then the larger number is
- if one zeroes of the polynomial 3x^2-8x+2k+1is seven times the other then the value of k is
- Ui
- Find the sum and the product of zeroes of the polynomial x2 +7x +10.
- Verify the relationship between zeroes and coefficients of the cubic polynomial p(x) = 3x^{3} - 5x^{2} - 11x - 3p(x)=3x3−5x2−11x−3.
- what should be added to the polynomial x ^2-5x+4 so that 3 is the zero of the polynomial
- What is the answer?
- Find the zeros of the quadratic polynomial (8x2 - 4) and verify the relation between its zeros and coefficients.
- If alpha and beta are the zeros of the quadratic polynomial f x is equal to 6 X square + X - 2 then find the value of Alpha minus beta
Kindly Sign up for a personalised experience
- Ask Study Doubts
- Sample Papers
- Past Year Papers
- Textbook Solutions
Sign Up
Verify mobile number
Enter the OTP sent to your number
Change