Use the intermediate value theorem to show that the polynomial f(x)=2x^4-11x^2+9 has a real 0 between -2 and 0

its 4 because 2 times 2 is 4, if you double the number two you get four

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: