Forskrift for exp funkt. ved to givet punkter

                                                       f(x) = y = b·a^x

hvoraf du har
                                                                 y₂/y₁ = a^x₂-x₁

                                                                 6/1 = a^3-(-7)

                                                                 6 = a¹⁰ ..............

Er det ikke nemmere at sige y2-y1-roden af x2-x1?

                      ...jeg ved ikke, hvad du synes

                                                                 a = 6^0,1 = 1,19623

                                                                 b = y₂ / 1,19623^x₂  = 6 / 1,19623³ = 3,50514

                                                       f(x) = y = 3,50514·1,19623^x