Question

QUIEN ME RESUELVA ESTO BIEN LE DOY CORONA 100% X 100

Answer 1

a)

${x}^{2} - 49 = 0 \\ {x}^{2} = 49 \\ x = \sqrt{49} \\ x = 7 \: \: \: o \: \: \: x = - 7$

b)

${x}^{2} + x = 0 \\ x(x + 1) = 0 \\ x = 0 \: \: \: o \: \: \: x + 1 = 0 \\ x = 0 \: \: \: o \: \: \: x = - 1$

c)

${x}^{2} - 3x = 0 \\ x(x - 3) = 0 \\ x = 0 \: \: \: o \: \: \: x - 3 = 0 \\ x = 0 \: \: \: o \: \: \: x = 3$

d)

$15 - {x}^{2} = 0 \\ {x}^{2} = 15 \\ x = \sqrt{15} \: \: \: o \: \: \: x = - \sqrt{15}$

e)

$x - {4x}^{2} = 0 \\ x(1 - 4x) = 0 \\ x = 0 \: \: \: o \: \: \: 1 - 4x = 0 \\ x = 0 \: \: \: o \: \: \: 4x = 1 \\ x = 0 \: \: \: o \: \: \: x = \frac{1}{4}$

f)

${x}^{2} - 3x + {2x}^{2} + 9x = 0 \\ {3x}^{2} + 6x = 0 \\ 3x(x + 2) = 0 \\ 3x = 0 \: \: \: o \: \: \: x + 2 = 0 \\ x = 0 \: \: \: o \: \: \: x = - 2$