Question: y = ax ^ 2 + bx + c 4 2 4 . 5 = 1 5 / L x ( 0 . 5 L

y=ax^2+bx+c
424.5=15/L x (0.5L +2)^2+(-2) x(0.5L +2)+(420+ L) L=?
the real answer is 13.466, show me step by step calcualtion how to get that answer.

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