Question

x(28+4x)=72 ayudenme porfavor

Answer 1

28x + 4x² = 72
4x² + 28x - 72 = 0

Answer 2

x (28 + 4x) = 72
28x + 4x² = 72
2² (x² + 7x - 18) = 0
x² + 7x - 18 = 0
x₁ = - 7 + √((7)² - 4 (- 18))/2
x₁ = - 7 + √(49 + 72)/2
x₁ = - 7 + √(121)/2
x₁ = (- 7 + 11)/2
x₁ = 4/2
x₁ = 2


x₂ = (- 7 - 11)/2
x₂ = - 18/2
x₂ = - 9

Resultado final.
x₁ = 2
x₂ = - 9