Question

(5x-14)*(3x+14)=1/2的解是多少

Answer 1

15xx+2*14x=14^2+1/2

xx+2*14/15x=14^2/15+1/30

(x+14/15)^2=14^2/15+1/30+14^2/15^2=[14^2*15*2+15+2*14^2]/115^2=[14^2*32+15]/15^2

x=-14/15加减根号[14^2*32+15]/15