1+1 what is it me i need i'm in 1st grade

What is the product of the radical expression. (7-2square root) (8+2 square root)

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)

Isaac wants the equation below to have no solution when the missing number is placed in the box. which number should he place in the box?