By any method, determine all possible real solutions

$5x^2-6=0$

The factors that affect worker productivity include

expenditures for TQM$/$Six Sigma training to enhance worker skills and the extent to which the S$/$Q ratings on the footwear being produced are above $5\mathrm{.}0$ stars.

the percentage use of refurbished equipment versus new equipment, the percentage use of overtime, and the extent to which the percentage use of superior materials exceeds the percentage use of standard materials.

whether workers are making branded or private$-$label shoes, and the complexity of the new features and styling that has been designed into the models$/$styles of footwear being produced

how much emphasis is placed on incentive compensation $($as measured by the percentage of the company's total compensation package accounted for by incentive pay$)$ and the amount the company spends annually per worker for best practices training.

the size of the year$-$end production bonuses granted to production workers, the percentage use of superior materials, and the hourly rate of overtime pay that workers get.