It depends on the value of x. If x is 1 then 10. If x is 2 then 17. If x is -3 then -18. I could go on....
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2x2-9x+4 = (2x-1)(x-4) when factored
Assuming it's a plus sign, that factors to (2x + 1)(x + 4)
The expression simplifies to: -7x-4
2x+4+7x-4 is the same as 9x
-4x-1-3x-4+5 = -7x-1-2x+1+6 -7x = -9x+6 2x = 6 x = 3