Question

Complete as igualdades

A) b^2 - _________+ 16 = (b-4)^2
B)9m^2+________+_______+=(_____+5)^2
C)______ - 28xy + 4y^2=(7x - _____)^2
D)_______ + 18a +________ = (a+9)^2

SOCORRO​

Answer 1

a) - 8b

b) +30m + 25 = (3m +5)²

c) 49x² = (7x - 2y)²

d) a² +18a + 81 = (a+9)²