factorizar:
a) x² - 9x + 20
b) x² + 13x +36
c) x² -9
d) 4x² -9y2
a) x² - 9x + 20
b) x² + 13x +36
c) x² -9
d) 4x² -9y2
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Respuesta:
A. (x-5)(x-4)
B. (x+4)(x+9)
C. (x+3)(x-3)
D. (2x+3y)(2x-3y)