Question

5. Dacă a+b=-4, calculați a²+2ab+b²-7a-7b.​

Answer 1

a²+2ab+b² - 7a-7b =

(a+b)² - 7(a+b) =

(-4)² - 7x(-4) =

16 + 28 =

44

Answer 2

Răspuns:

${a}^{2} + 2ab + {b}^{2} - 7a - 7b = {(a + b)}^{2} - 7(a + b) = {( - 4)}^{2} - 7 \times ( - 4) = 16 + 28 = 44$