exam Maths Puzzle Numerical Ability

i think it is simple but does not make sense to me [6 grade] 9-m=8

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Can you show me the steps to expand and solve

{{{3sqrt2(sqrt2+1)}}}
In a right triangle, one of the legs is 2 feet longer than the shorter leg. The hypotenuse is 10 feet. Find the lenghths of the missing 2 sides of the triangle.