Ответ:
-2x^2+7x+9=0
2x^2-7x-9=0
D=49+4*18=121
x1=(7+11)/2*2=4.5
x2=(7-11)/4=-1
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Ответ:
-2x^2+7x+9=0
2x^2-7x-9=0
D=49+4*18=121
x1=(7+11)/2*2=4.5
x2=(7-11)/4=-1