factor completely over the set of integers: 16x^4-81. Sara graphed the polynomial y=16x^4-81 and stated "All the roots of y=16x^4-81 are real" Is sara correct? Explain your reasoning answer

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .