8:55 A pdsb.elearningontario.ca 3 of 4 3 | Page 8. The product of 3 consecutive numbers is given. But when the smallest number is doubled but the other two numbers are increased by 1 the product of new numbers will now increase by 120. Write an expression that you will use to find the solution and solve it. Check all possible solutions [5] 9. A rocket is fired straight up from ground level with and initial velocity of 32 m/s. Its height above the ground at "t" seconds is given by, h(t) = -8t2 + 32t . During what time interval, its height is at least 19.5 m above the ground? Solve by using an intervals chart [4] Hint: You may need to use the quadratic formula x = =bivb2-4ac 2a 4 |Page 10. Determine all the zeros, both real and imaginary, of the polynomial function f (x) =-x* +1. [4] Hint: You may need to use difference/sum of cubes or difference of squares formula at - bz = (a - b)(a+ b) a3 - b3 = (a - b)(a2 + ab + b2) a3 + b3 = (a+ b)(a2 - ab + 62)