Question

f(x)=x ao quadrado-7+10​

Answer 1

Resposta:

Explicação passo-a-passo:

f(x)=x²-7+10​ => x²-7+10​ = 0 => Δ= b² - 4ac => Δ= (-7)² - 4(1)(10) => Δ= 49 - 40 => Δ= 9

x = - b±√Δ/2a => x = 7 ±√9/2.1 =>x = 7 ±3/2 => $x_{1} = \frac{7 + 3}{2} => x_{1} = \frac{10}{2} => x_{1} = 5 \\\\x_{2} = \frac{7 - 3}{2} => x_{2} = \frac{4}{2} => x_{2} = 2$