1) 2x+3=15
2x=12
x=6
2x+3=-15
2x=-18
x=-9
2) D=1-4*(-3)*4=49
x1=(-1+7)/2*4 = 6/8=3/4
x2=(-1-7)/2*4=-8/8=-1
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2)
1) 2x+3=15
2x=12
x=6
2x+3=-15
2x=-18
x=-9
2) D=1-4*(-3)*4=49
x1=(-1+7)/2*4 = 6/8=3/4
x2=(-1-7)/2*4=-8/8=-1