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x^2 + 4x^2 + 4x + 4x + 4 = 6x^2- 6x-6x+4
(1+4-6)x^2 + (4+4+6+6)x+ 4-4 = 0
-x^2 + 20x = 0
x (-x + 20) = 0
-x + 20 =0
x = 20
jdi sisi sikunya 20 dan (2×20+2)=42
sisi miring (3×20-2) = 58