267

a)
\left(x+3\right)^2=x^2+6x+9
b)
\left(x-2\right)^2=x^2-4x+4
c)
\left(x+5\right)^2=x^2+10x+25
d)
\left(7-x\right)^2=49-14x+x^2=x^2-14x+49