x^2
a)
x^2-14x+49= (x-7)^2 =(27-7)^2=20^2=400
b)
4$x^2$ +16x+16=(2x+4)^2 =(2*33+4)^2=70^2=4900
c)
25-30x+9$x^2$=(po uporządkowaniu)
9$x^2$-30x+25= (3x-5)^2=(3*(-25)-5)^2= (-75-5)^2=(-80)^2=6400
d)
81+72x+16$x^2$=16$x^2$+72+81=(4x+9)^2=(4*(-2)+9)^2= (-8+9)^2=(1)^2=1