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Question

14xx+19x30x4<0

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Solution


(14xx+1)(9x30x4)<0=(14x(x4)(9x30)(x+1)(x+1)(x4))<0=(14x256(9x2+9x30x30)(x+1)(x4))<0=(14x2569x2+21x+30(x+1)(x4))<0=(5x2+21x26(x+1)(x4))<05x2+21x26

will be always greater than zero (as D < 0)x(1,4)


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