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\[\sqrt{(-4x+5)^2} \]

the answer is (-4x + 5)

the square root and the exponent 2 are vanish

i think you are right, it would be
\(|-4x+5|\)

idk, because if you multiply both equations, the answer is the same.
(-).(-) = (+)

you could write \[\pm(-4x + 5)\]

but, satelite73 is not wrong. I think you can use both answers

Actually YES! Satellite is absolutely right :) |4x+5| is wrong. Thank you pigrenex!