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Use the Pythagorean Theorem.
15
In the formula, a and b are the legs and c is the hypotenuse of a right triangle. We are given a triangle with a=x-3, b=9. and c=x.
Substitute values
(a-b)^2=a^2-2ab+b^2
Calculate power
Multiply
Add terms
LHS-x^2=RHS-x^2
LHS-90=RHS-90
.LHS /(- 6).=.RHS /(- 6).