A wire is 10x-3 m long a length of 3x+5 m is cut put of it for use how much wire is left out

Question

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Answer 1

You are subtracting the entire amount of (3x+5). Therefore it should be rewritten as (10x - 3) - (3x + 5), which simplifies to (10x - 3 - 3x - 5). You then simplify by combining like terms 10x and 3x which = 7x and then combine like terms -3 and -5, which = -8. Therefore your answer is 7x - 8.

Answer 2

You just subtract the 2 lengths.

10x - 3 - (3x + 5) = 10x - 3 - 3x -5 = 7x - 8 m ANSWER

Answer 3

If you had a 10 m piece of wire and cut out a 3 m piece, how much would you have left?  You'd have 10 m - 3 m = 7 m left.  Works the same in your problem:

 

(10x-3) - (3x+5) = 10x - 3x - 3 - 5 = 7x-8 m