Question

докажите тождество (x+y) (x+b)=x2+(y+b) x+yb

Answer 1

(x+y)(x+b)=x²+xb+yx+yb=x²+x(y+b)+yb

Answer 2

$(x + y)(x + b) = {x}^{2} + xb + xy + yb = {x}^{2} + x(b + y) + yb$