Question

factorise 5n^2-9n-1136 =0​

Answer 1

5n²-9n-1136=0

5n²-80n+71n-1136=0

5n(n-16)+71(n-16)=0

(5n+16)(n-16)=0

5n+16=0 or n-16=0

n=-16/5 or n= 16

therefore, -16/5 and 16 is the solution.

Answer 2

a=5 b=-9 c=-1136

x=-b+-√b^2-4ac/2a

=-(-9)+-√81-4(5)(-1136)/2(5)

=9+-√81+22720/10

= 9+-√22801/10

=9+-151/10

from +ve

x=9+151/10

x =160/10

x =16

from -ve

x=9-151/10

x=-42/10

x=-21/5