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2352.2. Equation with two unknowns (either 1 or 2 degree)

Check the correct answer!

Which number pair is the equations x^2-y^2=9 solution?

It is known, that number pair (a; \sqrt{7} ) is equations solution. With what a is equal? (more than one answer may be possible, type the biggest value)
a=
Grade:
9
Subject
Algebra
Theme
Equation systems
Subtheme
Equation with two unknowns (either 1 or 2 degree)

Solve tasks to find hidden Geo point coordinates

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