2012 · Q63
Two students A and B solve an equation of the form x^2 + px + q = 0. A starts with a wrong value of p and obtains the roots as 2 and 6. B starts with a wrong value of q and gets the roots as 2 and -9. What are the correct roots of the equation?
Elementary MathematicsAlgebra
- A3 and -4
- B-3 and -4
- C-3 and 4
- D3 and 4
Explanation
A's roots give the correct q = 12 and B's roots give the correct p = 7; x^2+7x+12 = 0 has roots -3 and -4.