Question

Desenvolva os produtos notáveis:
a) (3x - 7)² =

b) (4a² +5)² =

c) (5x -8) (5x +8) =

Answer 1

a) (3x - 7)² = (3x-7)×(3x-7)= 9x²-21x-21x+49= 9x²-42x+49

b) (4a² +5)² = (4a² +5)×(4a² +5)=  16a^4+20a²+20a²+25= 16a^4 + 40a²+25

c) (5x -8) (5x +8) = 25x²40x-40x-64= 25x²-64

Answer 2

a) (3x - 7)² = 9x^2 - 42x + 49

b) (4a² +5)² = 16a^4 + 40a^2 + 25

c) (5x - 8) (5x + 8) = 25x^2 - 64