Question

quanto é 2x² - 7x = 0

Answer 1

$\mathtt{2x^2 -7x = 0} \\ \\ \mathtt{Fatorando} \\ \\ \mathtt{x(2x -7x) = 0} \\ \\ \mathtt{x' = 0} \\ \\ \mathtt{2x -7x = 0} \\ \mathtt{2x = 7} \\ \mathtt{x = \frac{7}{2} ~~~~ ou ~~~~~~3,5} \\ \\ \\ \boxed{\boxed{\mathtt{Resposta : S( 0~~e~~\frac{7}{2} ~~)}}}$

Answer 2

a= 2

b=-7

c=0

Δ=(-7)²-4.2.0

Δ=49