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Since you have a binomial for the hypotenuse, make sure you square the entire binomial.
Pythagorean theorem: a²+b²=c² where a and b are the legs and the c is the hypotenuse
Substitute your legs and hypotenuse into the formula and solve
64=8x+16 Subtract x² from both sides
48=8x Subtract 16 from both sides
x=6 Divide both sides by 8
Now you can use x=6 to solve for the leg and hypotenuse.
The leg is 6cm while the hypotenuse is 6+4, or 10cm.