((4x^2)/(3x+21))/((7x/5x+35))

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Solution for ((4x^2)/(3x+21))/((7x/5x+35)) equation: 


D( x )

((7*x)/5)*x+35 = 0

3*x+21 = 0

((7*x)/5)*x+35 = 0

((7*x)/5)*x+35 = 0

7/5*x^2 = -35 // : 7/5

x^2 = -25

3*x+21 = 0

3*x+21 = 0

3*x+21 = 0 // - 21

3*x = -21 // : 3

x = -21/3

x = -7

x in (-oo:-7) U (-7:+oo)

((4*x^2)/(3*x+21))/(((7*x)/5)*x+35) = 0

(4*x^2)/((3*x+21)*(7/5*x^2+35)) = 0

4*x^2 = 0 // : 4

x^2 = 0

x = 0

x = 0

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