Question

X²-900=0 ayuda porfa

Answer 1

Recuerda:

${a}^{2} - {b}^{2} = (a + b)(a - b)$

...

${x}^{2} - 900 = 0$

${x}^{2} - {30}^{2} = 0$

$(x + 30)(x - 30) = 0$

$x + 30 = 0 \: \: \: o \: \: \: x - 30 = 0$

$x = - 30 \: \: \: o \: \: \: x = 30$