Question

holaaa
ayuda plisss gracias te kelo
solo son 2
x^2-2x-3=0
-x^2-x=0

Answer 1

Explicación paso a paso:

1) x²-2x-3=0

x          -3

x           1

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

i)x - 3 = 0

x = 3

ii)x +1 =0

x = -1

Por tanto, x es 3 y -1

2) -x²-x = 0

Hallaremos x con la formula genral:

$x_{1,\:2}=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

Dato:

a = -1

b = -1

$x_{1,\:2}=\frac{-\left(-1\right)\pm \sqrt{\left(-1\right)^2-4\left(-1\right)\cdot \:0}}{2\left(-1\right)}\\\\x_{1,\:2}=\frac{-\left(-1\right)\pm \sqrt{\left1-0}}{2\left(-1\right)}\\\\x_{1,\:2}=\frac{-\left(-1\right)\pm \:1}{2\left(-1\right)}\\\\x_1=\frac{-\left(-1\right)+1}{2\left(-1\right)},\:x_2=\frac{-\left(-1\right)-1}{2\left(-1\right)}\\\\x_1 = \frac{1+1}{-2} ,\: x_2 = \frac{1-1}{-2} \\\\x_1 = \frac{2}{-2} ,\: x_2 = \frac{0}{-2} \\\\x_1 = -1 ,\: x_2 = 0$