1)144-m2=0
m2=144
m=12
2)(m-7)(m+2)-m(m-8)=0
m2+2m-7m-14-m2+8m=0
3m-14=0
3m=14
m=4,6
3)(2x+1x)(1-2x)=0
2x-4x2+x-2x2=0
x=0,25
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Answers & Comments
1)144-m2=0
m2=144
m=12
2)(m-7)(m+2)-m(m-8)=0
m2+2m-7m-14-m2+8m=0
3m-14=0
3m=14
m=4,6
3)(2x+1x)(1-2x)=0
2x-4x2+x-2x2=0
x=0,25