Fatore as expressões algébricas:
a) a² - 4a + 4
b) x² - 6x + 9
c) a² - 2ab + b² - c²
d) x² + 6x + 9 - a²b²
a) a² - 4a + 4
b) x² - 6x + 9
c) a² - 2ab + b² - c²
d) x² + 6x + 9 - a²b²
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a) a² - 4a + 4 ==> (a - 2 )²
b) x² - 6x + 9 ==> (x - 3 )²
c) a² - 2ab + b² - c² ==> [(a - b ) + c ] [(a - b ) - c ]
d) x² + 6x + 9 - a²b² ==> [( x + 3 ) + ab ][( x + 3 ) - ab ]