Tick (✓) the correct answer:
x2 + 6x + 8 = ?
(a) (x + 3)(x + 5)
(b) (x + 3)(x + 4)
(c) (x + 2)(x + 4)
(d) (x + 1)(x + 8)
$x^{2}+6 x+8$
$=x^{2}+4 x+2 x+8$
$=x(x+4)+2(x+4)$
$=(x+2)(x+4)$
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