The expression is given in standard form. Rewrite it in factored form. If it cannot be rewritten in factored form, write "cannot be done."
x3 + 4x² – 3x - 12

thats not a system of equations, that is a solution

b, i believe, but not sure.

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.