Question

solve : 5m2- 22m-15=0

Answer 1

5m^2 - 22m - 15 = 0

5m^2 - 25m + 3 m - 15 = 0

5m ( m - 5 ) + 3 ( m - 5 ) = 0

( 5m + 3) ( m - 5 ) = 0

m = 5, - 3 / 5

Answer 2

By quadratic formula

a=5, b=-22, c=-15

Now D= b2-4ac

(-22)^2-4(5)(-15)

484+300

784

m=-b+- rootD/2a

= 22+-28/10

=22+28/10

= 5

Now 22-28/10

=-6/10