Question

Calcule x² – y²: a) x = + 6 e y = + 5 b) x = – 7 e y = + 8 c) x = – 9 e y = – 5 d) x = + 12 e y = – 15

Answer 1

Resposta:

a) x = + 6  e  y = + 5  

6 * 6 = 36

5 * 5 = 25

36 - 25 = 9

b) x = – 7  e  y = + 8  

-7 * -7 = 49

 8 * 8 = 64

 49 – 64 = -15  

 

c) x = – 9  e  y = – 5

-9 * -9 = 81

-5 * -5 = 25

81 – 25 = 56

d) x = + 12  e  y = – 15

12 * 12 = 144

-15 * - 15 = 225  

144 – 225 = -81