Question

5.
If roots of the equation r?-15-m(2x-8)=0 are equal then m=?
1) 3,-5
2) 3,5
3) -3,5
4) -3,-5​

Answer 1

The equation can be rewritten as :

X2 −2mx+8m−15=0

D=(2m)2 −4×1(8m−15)=0

2 −4×1(8m−15)=0

4m2 −32m+60

⇒m2−8m+15=0

⇒m=3 or m=5