Question

determine x para que a sequencia (3x - 4; x + 12; 9x - 12) forme P.A

Answer 1

x+12-(3x-4)=9x-12-(x+12) x+12-3x+4=9x-12-x-12 -2x-9x+x= -24-16 -11x+x=-40 -10x=-40 x=-40/-10 x=4