Tick (✓) the correct answer:
a2 + bc + ab + ac = ?
(a) (a + b)(a + c)
(b) (a + b)(b + c)
(c) (b + c)(c + a)
(d) a(a + b + c)
$a^{2}+b c+a b+a c$
$=a^{2}+a b+b c+a c$
$=a(a+b)+c(a+b)$
$=(a+c)(a+b)$
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