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( x + 30 ) ( x + 10 ) = 0 igualamos ambos paréntesis a cero y resolvemos
x + 30 = 0 x + 10 = 0
x₁ = - 30 x₂ = - 10
primera comprobación con x = - 30
( - 30 )² + 40 ( - 30 ) + 300 = 0
900 - 1200 + 300 = 0
1200 - 1200 = 0 queda comprobado
segunda comprobación
( - 10 )² + 40 ( - 10 ) + 300 = 0
100 - 400 + 300 = 0
400 - 400 = 0 también queda comprobado