y2 + 14y + 49 = 0 Please help me :)

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21-05-2014
Mathematics

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y2 + 14y + 49 = 0 Please help me :)

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Аноним Аноним · Answer 1 · 2014-05-21T22:36:09+02:00

Аноним Аноним

21-05-2014

[tex]y^2+14y+49=0\\\\\underbrace{y^2+2\cdot y\cdot7+7^2}_{(*)}=0\\\\(y+7)^2=0\iff y+7=0\to y=-7\\\\-----------------------\\\\(*)\ \ \ (a+b)^2=a^2+2ab+b^2[/tex]

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