a3 - 2a2 + 4a - 8
= a2(a - 2) + 4(a - 2)
= (a - 2)(a2 + 4)
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First you can factor a^2 from the first two terms and 4 from the last two terms. (a^2)(a-2)+4(a-2) You can see that they both have (a-2) as a factor. So it is (a^2+4)(a-2)
8
5a - 10 = 4a + 8 is a linear equation in one variable.
a=-12
4*4+8 = 24