tentukan nilai m yg membuat grafik fungsi kuadrat berikut menyinggung sumbu x ...?
A. y = x² + (m + 2) x + (m + 5) =......
B. y = ( m-1)x² - 2mx + (m +2) = .....
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y = x² + (m + 2) x + (m + 5)
a = 1, b = (m + 2), c = (m + 5)
D = 0
b² - 4ac = 0
(m + 2)² - 4.1.(m + 5) = 0
m² + 4m + 4 - 4m - 20 = 0
m² - 16 = 0
m² = 16
m = √16
m = 4
yang b caranya sama....:) semoga membantu