Răspuns :
[tex]a - b = 5[/tex]
[tex] {a}^{2} - {b}^{2} = 70[/tex]
[tex](a - b)(a + b) = 70[/tex]
[tex]5(a + b) = 70 \: | \div 5[/tex]
[tex]a + b = 14[/tex]
[tex] {a}^{2} - {b}^{2} = 70[/tex]
[tex](a - b)(a + b) = 70[/tex]
[tex]5(a + b) = 70 \: | \div 5[/tex]
[tex]a + b = 14[/tex]