y=3x^2-2x-5当y与x互为相反数时x=?

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y=3x^2-2x-5当y与x互为相反数时x=?y=3x^2-2x-5当y与x互为相反数时x=?y=3x^2-2x-5当y与x互为相反数时x=?(1+根号61)/6或者(1-根号61)/6当y与x互为

y=3x^2-2x-5当y与x互为相反数时x=?
y=3x^2-2x-5当y与x互为相反数时x=?

y=3x^2-2x-5当y与x互为相反数时x=?
(1+根号61)/6或者(1-根号61)/6

当y与x互为相反数时 3x^2-2x-5=-x 3x^2-x=5 (x-1/6)^2=5/3+1/36 x=(√61+1)/6 或x=(1-√61)/6