Given any cubic or quartic equation with real coefficients, it can be transformed by a change of variable into a standard form, and thus solved by means of a double-sided scale (Fig. 1) in the ...

Note that a quadratic trend implies a linear trend as a special case and results in two regressors _QUAD_ and _LINEAR_. Cubic Trend Variable name _CUBE_, with X t =(t-c) 3. Note that a cubic trend ...

Equations of curves - Intermediate & Higher tier – WJEC Solving quadratic equations graphically - Higher Quadratic, cubic and exponential graphs are three different types of curved graphs.