lizbethazcona01 lizbethazcona01
  • 05-05-2020
  • Mathematics
contestada

За^2-12а = 15
Solve please

Respuesta :

Аноним Аноним
  • 05-05-2020

Answer:

a₁ = 5

a₂ = - 1

Step-by-step explanation:

3a² - 12a = 15

3a² - 12a - 15 = 0 | : 3

a² - 4a - 5 = 0

a² + a - 5a - 5 = 0

a(a + 1) - 5(a + 1) = 0

(a - 5)(a + 1) = 0

a - 5 = 0 => a₁ = 5

a + 1 = 0 => a₂ = - 1

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