Which expressions are polynomials? Select the two correct answers. x4+2y2+z−w2

x−3+x√

x−3−x+1

−4x8

Which equation shows the quadratic formula used correctly to solve 5x2 + 3x -4 0 for x? cos -3+ v (3) 2-4() 2(5) 3+ |(3)² +4() 205) 3+ (3) 2-4() -3+ v (3)² +4()