Question

x^2+4x=0

x^2-49=0

2x^2+1=x^2+2

5x^2+15=20x

2x^2-6x=0​

Answer 1

Respuesta:

x²+4x = 0

x(x+4) = 0

X1 = 0 y X2 = -4

x²-49 = 0

(x-7)(x+7) = 0

x1 = 7 y x2 = -7

2x²+1 = x²+2

1-2 = x²-2x²

-1 = -x²

-1/-1 = -x²/-1

1 = x²

1-x² = x²-x²

1-x² = 0

(1-x)(1+x) = 0

X1 = 1 y X2 = -1

5x²+15 = 20x

(5x²/5)+(15/5) = (20x/5)

x²+3 = 4x

x²+3-4x = 4x-4x

x²+3-4x = 0

x²-4x+3 = 0

x²-x-3x+3 = 0

x(x-1)-3(x-1) = 0

(x-1)(x-3) = 0

X1 = 1 y X2 = 3

2x²-6x = 0

(2x²/2)-(6x/2) = 0/2

x²-3x = 0

x(x-3) = 0

X1 = 0 y X2 = 3

Explicación paso a paso: