solve : 5m2- 22m-15=0
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Answered by
22
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
5m^2 - 25m + 3 m - 15 = 0
5m ( m - 5 ) + 3 ( m - 5 ) = 0
( 5m + 3) ( m - 5 ) = 0
m = 5, - 3 / 5
Answered by
3
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
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