Question

Calcule a : (2x+8)², B: (25-5y)² C: (14z-10)×(14z+10)

Answer 1

a:(2x+8)•(2x+8)
4x²+16x+16x+64
4x²+32x+64 simplificando(÷4) fica:
r:x²+8x+16

b:(25-5y)•(25-5y)
625-125y-125y+25y² (sinal - x - inverte)
25y²-250y+625 simplificando(÷25) fica:
r:y²-10y+25

c:(14z-10)•(14z+10)
196z²+140z-140z-100
r:196z²-100