Let
Thenbecomes:
3a(2a + 13) – 8(2a + 13) = 0
(3a – 8)(2a + 13) = 0
3a – 8 = 0 OR 2a + 13 = 0
OR
---------- Substituting for a
---- Squaring both sides
---------- Substituting for a
No expression raised to a power results in a negative expression (< 0), sois an EXTRANEOUS solution.
Therefore, only solution is: