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Express 7 as a difference of squares
In how many ways can 30 be expressed as a difference of squares in whole numbers?
Solve x2 – y2 = 11 in whole numbers:
Solve (x–1)2 – (x–3)2 = 20 in whole numbers:
Solve (x+2)2 – (y+1)2 = 16 in whole numbers
Solve (2x–1)2 – (y+2)2 = 17 in whole numbers
The base of a right-angled triangle is 13. What are the other sides given that they are whole numbers?