4 years ago

Solving equation r^2+5r=-4

1 answer:

3 0

$r^2+5r=-4\\\\r^2+5r+4=0\\\\r^2+r+4r+4=0\\\\r(r+1)+4(r+1)=0\\\\(r+4)(r+1)=0\\\\r=-4 \vee r=-1$

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