Question

- 5x elevado a 2 + 45 = 0​

Answer 1

Resposta:

x = +-9

Explicação passo a passo:

-5x^2 + 45 = 0

-5x^2 = -45 (-)

x^2 = 45/5

x^2 = 9

x = +-9

Vilmar

Answer 2

$\mathsf{-5x^2+45=0}\\\mathsf{-5x^2=-45}\\\\\mathsf{x^2=\dfrac{-45}{-5}}\\\\\mathsf{x^2=9}\\\mathsf{x=\pm\sqrt9}\\\mathsf{x=\pm3}\\\\\boxed{\boxed{\mathsf{S = \{3,\ -3\}}}}$