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x² + (-2x+p)² + 6x - 2(-2x+p) - 35 = 0
x² + 4x² - 4px + p² +6x + 4x -2p - 35 = 0
5x² + (-4p+10)x + (p²-2p-35) = 0
syarat menyinggung D = 0
(-4p+10)² - 4(5)(p²-2p-35) = 0
16p² - 80p + 100 - 20p²+ 40p + 700 = 0
-4p² - 40p + 800 = 0
p² + 10p - 200 =0
(p + 20)(p-10) = 0
p = -20 atau p = 10