а)2x^2+9x-2x-2x-9=0
x+(2x-9)-(2x+9)=0
2x+9=0
x-1=0
x=1/9 x=1
б)(x+5)×(x-8)=0
x+5=0
x=-5
x-8=0
x=8
в)7x^2-42x=0
7x-(x-6)=0
x=(x-6)=0
x=0
x-6=0
x=6
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Answers & Comments
а)2x^2+9x-2x-2x-9=0
x+(2x-9)-(2x+9)=0
2x+9=0
x-1=0
x=1/9 x=1
б)(x+5)×(x-8)=0
x+5=0
x=-5
x-8=0
x=8
в)7x^2-42x=0
7x-(x-6)=0
x=(x-6)=0
x=0
x-6=0
x=6