Question

Necesito ayuda con matemática algebraica
4x²-8=0

21x²-7x=0

4x²=12x

Answer 1

Respuesta:

$4x {}^{2} - 8 = 0 \\ 4x {}^{2} - 8 + 8 = 0 + 8 \\ 4x {}^{2} = 8 \\ \frac{4 {x}^{2} }{ 4} = \frac{8}{4} \\ x {}^{2} = 2 \\ x = \sqrt{2} \\ x = - \sqrt{2} \\ x = 1.4142$