The SIMPLE substitution: Let 

Then , and  becomes: 

 ------ Repalacing a, with 9a - 8a

3a(a + 3) - 8(a + 3) = 0

(a + 3)(3a - 8) = 0

 



 ------- Substituting back 

 ------ Raising each side to the - 1 power

 

Substitute this value for x () into the original equation. If this value satisfies the original equation, then  is a solution to the equation. 

This value for x DOES SATISFY the equation.



 ------- Substituting back 

 ------ Raising each side to the - 1 power

 

Substitute this value for x () into the original equation. If this value satisfies the original equation, then  is a solution to the equation.

This value for x DOES SATISFY the equation. 

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