<span>4x12 – 5x6 – 14 = 0 this equation is equivalent to </span>4(x^6)² – 5(x^6) – 14 = 0 so if u=x^6 we have 4(u)² – 5(u) – 14 = 0, and it is a quadratic equation
To calculate the gradient of a straight line we choose two points on the line itself. The difference in height (y co-ordinates) ÷ The difference in width (x co-ordinates).
