(21x^2+30x+49x+70)/8

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Solution for (21x^2+30x+49x+70)/8 equation: 


x in (-oo:+oo)

(21*x^2+30*x+49*x+70)/8 = 0

(21*x^2+79*x+70)/8 = 0

21*x^2+79*x+70 = 0

21*x^2+79*x+70 = 0

DELTA = 79^2-(4*21*70)

DELTA = 361

DELTA > 0

x = (361^(1/2)-79)/(2*21) or x = (-361^(1/2)-79)/(2*21)

x = -10/7 or x = -7/3

(x+7/3)*(x+10/7) = 0

((x+7/3)*(x+10/7))/8 = 0

( x+10/7 )

x+10/7 = 0 // - 10/7

x = -10/7

( x+7/3 )

x+7/3 = 0 // - 7/3

x = -7/3

x in { -10/7, -7/3 }

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