Răspuns :
a²-b² = 45 (a+b)(a-b)=45
a+b=15
15*(a-b)=45
a-b=3
5a-5b =5(a-b)=5*3=15
a+b=15
15*(a-b)=45
a-b=3
5a-5b =5(a-b)=5*3=15
a² - b² = 45
(a + b)(a - b) = 45
a + b = 15
15(a - b) = 45 | : 3
5(a - b) = 15
(a + b)(a - b) = 45
a + b = 15
15(a - b) = 45 | : 3
5(a - b) = 15