Explicación paso a paso:
a)
x^2 -10x +21
x -7=-7x
x -3=-3×
=-10x
(x-7)(x-3)
b)
a^2 -3a -10
a -5 =-5a
a +2 = 2a
= -3a
(a-5)(a+2)
c) m^2+11m+18
m +9 = 9m
m +2 = 2m
= +11m
(m+9)(m+2)
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Explicación paso a paso:
a)
x^2 -10x +21
x -7=-7x
x -3=-3×
=-10x
(x-7)(x-3)
b)
a^2 -3a -10
a -5 =-5a
a +2 = 2a
= -3a
(a-5)(a+2)
c) m^2+11m+18
m +9 = 9m
m +2 = 2m
= +11m
(m+9)(m+2)