Respuesta :

TheHero
The expression is just the difference between both

"How much shorter the base is" it implies that the base is shorter than the side so to get a positive quantity for the difference you either subtract the side from base or use absolute value sign

let the difference be d

d = ax + 9 - 4x -b = (a-4)x + (9-b) 

d is the requirement.

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