Question

Quais as raízes da expressão?
(x+3)²=4

Answer 1

$(x+3)^2=4\\\\ x+3= \pm\sqrt{4} \\\\ x=2-3=-1\\ ou\\ x=-2-3=-5$

Answer 2

(x+3).(x+3)=4
x²+3x+3x+9=4
x²+6x+9=4
x²+6x+9-4=0
x²+6x+5=0 →a=1 →b=6 →c=5

∆=b²-4ac
∆=6²-4.1.5
∆=36-20
∆=16
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x= -b+-$\sqrt{(delta)}$
     _____________________
                     2a
x=-6+-4
    ____
       2

x1=-5 x2=-1