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x² = 45/5
x² = 9
x = +- √ 9
x₁ = 3 x₂ = - 3
Toda raíz cuadrada tiene dos soluciones
2.- Ecuación x² + 2 x = 4 pasamos el 4 e igualamos a cero
x² + 2 x - 4 = 0 es ecuación de segundo grado
Resolvemos por fórmula donde a = 1 ; b = 2 ; c = -4
x₁,₂ = -2 +- √ 2² - 4 ( 1 ) ( - 4) / 2
x₁,₂ = - 2 +- √ 4 + 16 / 2
x₁,₂ = - 2 +- √ 20 / 2 = - 2 +- 4.4721 / 2
x₁ = - 2 + 4.4721 / 2 = 2.4721 / 2 = 1.23605
x₂ = - 2 - 4.4721 / 2 = - 6.4721 / 2 = - 3.23605
3.- Ecuación x² + 9x = 0 Factorizamos
x ( x + 9 ) = 0 igualamos cada factor a cero
x₁ = 0 ; x + 9 = 0
x = 0 -9
x₂ = -9