Question

PRODUTOS NOTAVEIS
Exemplo,
(3a − y)2 = (3a)2− 2(3a)(y) + (y)2 = 9a2 − 6ay + y2.
1. Calcule os quadrados
(a) (x − y)2
(b) (a − 2)2
(c) (3x − 2)2
(d) (3x − y)2
(e) (a − 4x)2

Answer 1

A) $(x-y) ^{2}= x^{2} -2xy+ y^{2}$

B)$(a-2) ^{2} =( a^{2}-2*a*2+4) = a ^{2}-4a+4$

C)$(3x-2) ^{2} =(9 x^{2} -12x+4)=-(-12)+- \sqrt{ -12^{2}-4*9*4 }/2*9= \\ 12/18=2/3$

D)$(3x-y)^{2}= 9x^{2} -6xy+ y^{2}$

E)$(a-4x)^{2}= (a^{2}-8ax+16x)$