(x-1)(x-2)+(x+3)(x-3)+3x+18=0
x^2-2x-x+2+x^2+3x-3x-9+3x+18=0
2x^2+11=0
D=0-4*2*11=-88
D<0, корней нет.
(Зx − 5)^2 − 5(5 − 6x) = 0
9x^2-30x+25-25+30x=0
9x^2=0
x=0
(x − 7)^2 + 7(2x − 14) = 0
x^2-14x+49+14x-98=0
x^2-49=0
(x-7)(x+7)=0
x1=7, x2=-7
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Answers & Comments
(x-1)(x-2)+(x+3)(x-3)+3x+18=0
x^2-2x-x+2+x^2+3x-3x-9+3x+18=0
2x^2+11=0
D=0-4*2*11=-88
D<0, корней нет.
(Зx − 5)^2 − 5(5 − 6x) = 0
9x^2-30x+25-25+30x=0
9x^2=0
x=0
(x − 7)^2 + 7(2x − 14) = 0
x^2-14x+49+14x-98=0
x^2-49=0
(x-7)(x+7)=0
x1=7, x2=-7