Find all the real zeros of the polynomial. Use the quadratic formula if necessary, as in Example 3(a). (Enter your answers as a comma-separated list. Enter all answers including repetitions.) P(x) = x4 - 9x3 + 26x2 - 21x - 9 X = X Need Help? Read It Watch It Submit Answer 10. [-/11 Points] DETAILS SPRECALC7 3.4.073. Show that the given values for a and b are lower and upper bounds for the real zeros of the polynomial. P(x) = x4 + 2x3 + 3x2 + 5x - 1; a = -2, b = 1 for a = -2: - 2L Since the row containing the quotient and remainder has [---Select-- v , a = -2 is ---Select-- v for b = 1: Since the row containing the quotient and remainder has [---Select--- v , b = 1 is -Select-- v Need Help? Read it Watch It Submit Answer 11. [-/1 Points] DETAILS SPRECALC7 3.4.099. MY A graphing calculator is recommended. A grain silo consists of a cylindrical main section and a hemispherical roof. If the total volume of the silo (including the part inside the roof section) is 17,000 fts and the cylindrical part is 30 ft tall, what is the radius of the silo, correct to the nearest tenth of a foot? ft Activ 30 ft Go to