A number which can be represented both in the form x_0^2 - D y_0^2 and in the form D x_1^2 - y_1^2. This is only possible when the Pell equation x^2 - D y^2 = - 1 is solvable. Then x^2 - D y^2 | = | -(x_0 - D y_0^2)(x_n^2 - D y_n^2) | = | D(x_0 y_n - y_0 x_n)^2 - (x_0 x_n - D y_0 y_n)^2.
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My son was suffering from low confidence in his educational abilities. I was in need of help and quick. Club Z! assigned Charlotte (our tutor) and we love her! My son’s grades went from D’s to A’s and B’s.
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Jonathan is doing really well in all of his classes this semester, 5 A’s & 2 B’s (he has a computer essentials class instead of PLC). In his Algebra class that Nathan is helping him with he has an A+.
Sarah is very positive, enthusiastic and encourages my daughter to do better each time she comes. My daughter’s grade has improved, we are very grateful for Sarah and that she is tutoring our daughter. Way to go ClubZ!
