Question

Resolva as equaçoes 1) x(x-3)=-5x 2)6x²-4x=5x²-2x ???

Answer 1

1) x ( x -3) = -5x
x² -3x = -5x
x² -3x +5x 
x² +2x +0
Δ= b² -4ac
Δ= 2² -4.1.0
Δ= 4

x= -b +/- √Δ / 2a
x= -2 +/- √4 / 2.1
x'= -2 +2 /2
x'= 0/2
x'= 0

x''= -2 -2 /2
x''= -4/2
x''= -2

B) 6x² -4x = 5x² -2x
6x² -5x² -4x +2x
x² -2x +0
Δ= b² -4ac
Δ= (-2)² -4.1.0
Δ= 4

x= -b +/- √Δ /2a
x= -(-2) +/- √4 / 2.1
x'= 2 +2/2
x'= 4/2
x'= 2

x''= 2 -2/2
x''= 0/2
x''= 0

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