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7+ 7,5 : 2 = 7,25
x1+ x2 = -b/a
(7- akar 57) / 4 + (7+ akar 57) 4 =- b/a
14/4=-b/a
x1.x2= c/a
(7- akar 57)/4 × (7+ akar 57)/4= c/a
49/ 16 - 57/16
-8/16
-2/4=c/a
(x+x1)(x+x2)=0
x^2+ (x1+x2) x + x1.x2=0
x^2 + 14/4 × + (-2/4)=0
4x^2+14×-2=0