solve 1-5= -4m^sq

1-5=-4m^2

-4=-4m^2

Dividing by -4 on both sides
we have:

(-4)/(-4)=(-4m^2)/(-4)
1=m^2

Take the square root of both
sides we have:

sqrt(1)=sqrt(m^2)

1=m or

m=1

Hope this helps.