-16a^4+40a^5/20a^5

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Solution for -16a^4+40a^5/20a^5 equation: 


a in (-oo:+oo)

((40*a^5)/20)*a^5-16*a^4 = 0

2*a^10-16*a^4 = 0

2*a^4*(a^6-8) = 0

1*a^6 = 8 // : 1

a^6 = 8

a^6 = 8 // ^ 1/6

abs(a) = 8^(1/6)

a = 8^(1/6) or a = -8^(1/6)

2*a^4 = 0

2*a^4 = 0 // : 2

a^4 = 0

a = 0

a in { 8^(1/6), -8^(1/6), 0 }

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