tolong dong pake caranya no5,6,7,8pake caranya y

[tex]7. \: \: \: {13}^{2} + {3}^{2} - {12}^{2} = 169 + 9 - 144 = 169 - 135 = 34[/tex]

6. 13² + 3² - 12² = 169 + 9 - 144 = 178 - 144 = 34
c. 34