Question

-3x2 +51x-156
factorise it

Answer 1

-3x²+51x-156=0

-x+17x-52=0....... (Dividing by 3)

Comparing the above equation with

ax²+bx+c

a=-1 , b=17 and c= -52

b²-4ac=(17) ²-4×-1×-52

=289-208

= 81

x= -b±√b²-4ac/2a....(Formula)

x= -17±√81/-2

x=-17+9/-2 or x= -17-9/-2

x=-8/-2 or x= -26/-2

x= 4 or 13