Răspuns :
25²-x²=7²
25²=625
7²=49
625-x²=49
625-49=x²
576=x²⇒x=√576⇒x=24
ca verificare
25²-24²=625-576=49
dar 49 inseamna 7x7, adica 7²
25²=625
7²=49
625-x²=49
625-49=x²
576=x²⇒x=√576⇒x=24
ca verificare
25²-24²=625-576=49
dar 49 inseamna 7x7, adica 7²