Kerjakan bagian B dengan lengkap....
Pake cara ya....
Pake cara ya....
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y = x-8
y =x² - 3x - 4
x² - 3x - 4 = x - 8
x² - 3x - x - 4 + 8 = 0
x² - 4x + 4 = 0
diskriminan D= b²- 4ac
D = (-4)² - 4(1)(4)
D= 0
tanda D = 0
banyak penyelesaian = 1 , yaitu
x² - 4x + 4 =0
(x -2)² = 0
x = 2 dan y = x - 8 -->y = 2-8 = -6
(x,y)= (2, -6)