40 ^ 2 + 4a = 0
1600 + 4a = 0
4a = - 1600 Divide both sides with 4
a = - 1600 / 4
a = -400
According to what you show in your solution, your equation was probably
40a^2 + 4a = 0
4a(10a + 1) = 0
so 4a = 0 or 10a+1 = 0
a = 0 or a = -1/10
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