Question

One root of the quadratic equation (2x-3) (x+5)=0 is -5, then the other root is

A. 5 B.

3

2

−

C. 3

2

D. 2​

Answer 1

Answer:

2x3−6x2−3x+5

sum of roots of cubic equation ax3+bx2+cx+dis −b/a

therefore sum of roots will be -(-6)/2=3

we can check the answer by finding the roots and adding them

roots of this equation are −1,2+6√2,2−6√2

which add upto 3 so our answer is correct