Which is an acute scalene triangle?

it is a triangle with angles that are all different and they are all less than 90 degrees.

Step-by-step explanation:

All three sides and internal angles of a scalene acute triangle are unequal, that is, all angles measure less than 90 degrees.

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis: