b) x² + 25 = 61 d) 3x² - 6x = 0 f) 2x² + 7 = 9
Soluções para a tarefa
Resposta: b) 6 d) S = {0, 2} f) 1
Explicação passo a passo:
x²+ 25 = 61
x² = 61 - 25
x² = 36
x = 6 (tirei a raiz quadrada)
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Identifique os coeficientes
a = 3, b = -6 e c = 0
Calcule o valor de delta
Δ = b² - 4ac
Δ = (-6)² - 4.3.0 = 36 - 12.0
Δ = 36 - 0 = 36
Substitua os valores de a, b e Δ (o discriminante) na fómula de Bhaskara
x = -b ± √Δ
2a (ta em fração)
x = -(-6) ± √36
2.3 (ta em fração)
x = 6 ± √36
6 (ta em fração)
x₁ = 6 - √36 = 6 - 6 = -0 = 0
6 6 6 (ta em fração)
x₂ = 6 + √36 = 6 + 6 = 12 = 2
6 6 6
S = {0, 2}
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2x² + 7 = 9
2x² = 9 - 7
2x² = 2
x² = 2/2
x² = 1
x = 1 ( raiz de 1 é 1)