Question

xao quadrado-7x+10=0

Answer 1

x² - 7x + 10 = 0
a = 1
b = - 7
c = 10

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' = (7 + 3) ÷ 2
x' = 10 ÷ 2
x' = 5

x" = (7 - 3) ÷ 2
x" = 4 ÷ 2
x" = 2

Resposta: {5; 2}