Question

找规律5^2-3^2=8*2;9^2-7^2=8*4;15^2-3^2=8*27

Answer 1

5^2-3^2=8*2;9^2-7^2=8*4;15^2-3^2=8*27

a^2+b^2=(a+b)^2

或

a^2-b^2=(a-b)^2

a=4 b=1

4^2+1^2=(4+1)^2=5^2=25

4^2-1^2=(4-1)^2=3^2=9