Tìm min A = x^2 + 5x + 196 B = (x + 1)^2 + (3x - 4)^2

tìm MIN A=x^2+5x+196
B= (x+1)^2+(3x-4)^2
tìm x
(x-4)(x^2+4x+16)+x(x+5)(5-x)=12