can someone please help me find a number for a that CAN NOT BE USED -1 + 5 x- 9 ( - 2 + 5 x ) = a x + b

Answer 1

I have no idea what your question means.

Arithmetic operations give the result:

- 1 + 5 x - 9 ( - 2 + 5 x ) = a x + b

- 1 + 5 x - 9 ∙ ( - 2 ) - 9 ∙ 5 x = a x + b

- 1 + 5 x + 18 - 45 x = a x + b

- 40 x + 17 = a x + b

a = - 40 , b = 17

Answer 2

so, any a ≠ -40 does not satisfy the equation