3a + 27 = 0
1. First you subtract 27 from both sides to isolate 3a, the variable.
3a = -27
2. Divide both sides by 3 to get a by itself
a = -9
The final answer is a = -9
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Sum and difference of two cubes is factored this way : a3 + b3 = (a + b)(a2 - ab + b2) a3 - b3 = (a - b)(a2 + ab + b2)
(a + 4)(a^2 - 4a + 16)
This is the formula: (a3)+(b3)=(a+b)(a2-ab+b2)
(x3 - 8) is factored thus: (x - 2)(x2 + 2x + 4) The easiest way to do this is to remember the formula: (a3 - b3) = (a - b)(a2 + ab + b2)
a3-4a = a(a2-4) when factored