Question

Quando a = b = − 2 , determine o valor numérico da expressão algébrica: (− a − b) . (a + b) + ab³ - a²/b= ME AJUDEM POR FAVOOORRR

Answer 1

Eh soh colocar -2 no lugar de a e b:

$(-a- b) \cdot (a + b) + ab^3 - \dfrac{a^2}{b}=\\\\\\(-(-2)- (-2)) \cdot ((-2) + (-2)) + (-2)(-2)^3 - \dfrac{(-2)^2}{(-2)}=\\\\\\(2+2)\cdot(-2-2)+(-2)(-8)-\dfrac{4}{-2}=\\\\\\4\cdot(-4)+16-(-2)=\\\\\\-16+16+2=\\\\\boxed2$