Answer :
m = 3,-2, as
4m - 2 = 10 and 4m - 2 = -10
4m = 12 and 4m = -8
m = 3 and m = -2
[tex] \left \{ {{4m-2=10} \atop {4m-2=-10}} \right. \\ \left \{ {{4m=12} \atop {4m=-8}} \right. \\ \left \{ {{m= \frac{12}{4} } \atop {m=- \frac{8}{4} }} \right. \\ \left \{ {{m=3} \atop {m=-2}} \right. [/tex]
