Question

si a = -2 y b = 5. el valor numerico de la expresion -15 a2/b - 2ab es:

Answer 1

-15 a²/b - 2ab

-15 (-2)²/5 - 2(-2)5

-15 (4)/5 +20

-3(4) + 20

-12 +20

=8

Answer 2

-15*(-2)*2/5-2*(-2)*5
-15*(-4)/5+4*5
-15*(-4/5)+20
12+10 =32