Respostas

2013-12-09T00:10:50-02:00
5^{x^2+2x}=125
5^{x^2+2x}=5^3
x^2+2x=3
x^2+2x-3
Δ= b²-4ac
Δ= (2)²-4×1×(-3)
Δ=4-(-12)
Δ=16

x'= -b +√Δ/2a
x'= -2 +√16/2
x'= -2+4/2
x'= 1

x''= -b -√Δ/2a
x''= -2 - √16/2
x''= -2-4/2
x''= -3
8 4 8
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Por nada Ka :)