can you please assist me with the formula and solution so i may check my daughters work

Using the intermediate value theorem , determine if possible , whether the function if has at least one real zero between a and b ( X ) = X 3 + 3 X 2 - 7x - 12:2 5 - 8 1 = - 3 Select the correct choice below and if necessary . fill in the ry . fill in the answer boxes to complete your choice A . By the intermediate value theorem , the function has at least one real zero between a and b because fla and ( b ) ( Simplify your answers . ) B . By the intermediate value theorem , the function does not have at least one real zero between a and b because of ( a ) and f (b ) ( Simplify your answers . ) . C . It is impossible to use the intermediate value theorem in this case