Объяснение:
A) (5+x)^2=x^2+10x+25
B) (1-3x)^2=9x^2-6x+1
C) (3a+7b)^2=9a^2+42ab+49b^2
D) (x^2+4)^2=x^4+8x^2+16
Объяснение:
A) (5+x)^2=x^2+10x+25
B) (1-3x)^2=9x^2-6x+1
C) (3a+7b)^2=9a^2+42ab+49b^2
D) (x^2+4)^2=x^4+8x^2+16