factorize a^2 + a - 72
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Answer:
Consider the form
x
2
+
b
x
+
c
. Find a pair of integers whose product is
c
and whose sum is
b
. In this case, whose product is
−
72
and whose sum is
1
.
−
8
,
9
Write the factored form using these integers.
(
a
−
8
)
(
a
+
9
)
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