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y = ax + 4
y = ax² + x + 2
y = y
ax² + x + 2 = ax + 4
ax² + (1-a)x - 2 = 0
D = 0
(1-a)² - 4a (-2) = 0
1 - 2a + a² + 8a = 0
a² + 6a + 1 = 0
(a + 3)² + 1 = 9
(a + 3)² = 8
a + 3 = 2√2 → a = -3 + 2√2
atau
a + 3 = -2√2 → a = -3 - 2√2