Question

Determine o valor de x na equação, Ax-1, 2=30 ​

Answer 1

A(x-1, 2) = 30

(x-1).(x-2) = 30

x² -3x +2 = 30

x² -3x -28 = 0

∆= 9 +112=121 ==> √∆=11

x = -b+√∆/2a = 3+11/2 = 14/2 = 7 ✓