a) x=-3
0=(3-m)*(-3)+1
0=-9+3m+1
0=-8+3m
8=3m
m=8/3=2 2/3
b) x=1
0=(m²-5)*1-20
0=m²-5-20
0=m²-25
25=m²
m=5 v m=-5
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a) x=-3
0=(3-m)*(-3)+1
0=-9+3m+1
0=-8+3m
8=3m
m=8/3=2 2/3
b) x=1
0=(m²-5)*1-20
0=m²-5-20
0=m²-25
25=m²
m=5 v m=-5