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Question Number 150889 by mathdanisur last updated on 16/Aug/21

Answered by dumitrel last updated on 16/Aug/21

$$\iff a^2+a(b+c+d)+{(b+c+d)}^2⩾0\iff$$$${(\frac{a}{2}+b+c+d)}^2+\frac{3a^2}{4}⩾0$$$$,,{=}^{″}fora=0;b+c+d=0$$

Commented by mathdanisur last updated on 16/Aug/21

$$\mathrm{Thank}\mathrm{you}\mathrm{Ser}\mathrm{nice}$$

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