Question

a) (x + y) . ( x - y) =
b) (y – 7 ) . (y + 7) =
c) (x + 3) . (x – 3) =
d) (2x + 5 ) . (2x – 5) =
e) (3x – 2 ) . ( 3x + 2) =
f) (5x + 4 ) . (5x – 4)
h) (1-5x) . (1+5x)=​

Answer 1

Resposta:

a) x.x -x.y +y.x -y.y

= x²- 6²

b) y.y +y.7 -7.y -7.7

= y²-49

c) x² -3x+3x -9

= x²-9

d) 4x² -10x+10x-25

= 4x² -25

e) 9x²+6x-6x-4

= 9x²-4

f) 25x² -20x+20x -16

=25x²-16

h) 1 +5x -5x - 25x²

= -25X² +1