f) 9x2 + 36x – 189 = 0
BiaEmanuela:
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Soluções para a tarefa
Respondido por
2
Resposta:
Explicação passo-a-passo:
9x² + 36x - 189 = 0 Vamos dividir tudo por 9 para facilitar.
x² + 4x - 21 = 0
x = - 2 + - √4 + 21
x = - 2 + - √25
x' = - 2 + 5 ⇒ 3
x" = - 2 - 5 ⇒ - 7
Respondido por
1
Resposta:
9×2=18 18×36=648 648-189=459
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