(x/7x-21)(x^2-3x/5)

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Solution for (x/7x-21)(x^2-3x/5) equation: 


x in (-oo:+oo)

((x/7)*x-21)*(x^2-((3*x)/5)) = 0

((x/7)*x-21)*(x^2+(-3/5)*x) = 0

(1/7*x^2-21)*(x^2-3/5*x) = 0

x^2-3/5*x = 0

x*(x-3/5) = 0

x-3/5 = 0 // + 3/5

x = 3/5

x*(x-3/5) = 0

x*(1/7*x^2-21)*(x-3/5) = 0

( 1/7*x^2-21 )

1/7*x^2 = 21 // : 1/7

x^2 = 147

x^2 = 147 // ^ 1/2

abs(x) = 7*3^(1/2)

x = 7*3^(1/2) or x = -(7*3^(1/2))

( x-3/5 )

x-3/5 = 0 // + 3/5

x = 3/5

( x )

x = 0

x in { 7*3^(1/2), -(7*3^(1/2)), 3/5, 0 }

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