Addition is commutative. That is, a + b = b + a for all a, b
7 + 8 = 15 = 8 + 7 The commutative property of addition states that a + b = b + a for any a and b.
(b + 4)(b + 4)
(b + 8)(b + 4)
(b + 8)(b - 1)
5b = 8 b = 8/5 or 1.6
(b+8)(b+4)
(b + 8)(b + 4)
-8 + b = 4 add 8 to both sides: b = 12
5b = 8 therefore b = 8/5 therefore b = 1.6
b2 + 16b + 64 can be factorized to (b+8)(b+8). If they were equal to zero as in b2 + 16b + 64=0 then b = -8.
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