Ответ:
9x^2-42x+49>=49x^2-42x+9
9x^2-49x^2-42x+42x>=9-49
-40x^2>=-40
x^2<=1
-1<=x=<1
x [-1;1]
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Ответ:
9x^2-42x+49>=49x^2-42x+9
9x^2-49x^2-42x+42x>=9-49
-40x^2>=-40
x^2<=1
-1<=x=<1
x [-1;1]