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SandyM
a fost răspuns

Rezolvati , va rog : x^2 + 2x = 143 (^2 - puterea a doua)

Răspuns :

[tex]x^2+2x=143\\ x^2+2x-143=0\\ \Delta=4+4\cdot 143=576\Rightarrow \sqrt{\Delta}=24\\ x_1=\dfrac{-2+24}{2}=11\\ x_2=\dfrac{-2-24}{2}=-13\\ \boxed{S:x\in \{11,-13\}}[/tex]

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