Fatore as seguintes expressões:
a) x2 – 4
b) y2 – 36
c) 9x2 – 16
d) 81x2 – 64
e) y2 – 25x2
f) 4x2 – 25a2
g) x2 + 8x + 16
a) x2 – 4
b) y2 – 36
c) 9x2 – 16
d) 81x2 – 64
e) y2 – 25x2
f) 4x2 – 25a2
g) x2 + 8x + 16
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