Two of the steps in the derivation of the quadratic formula
are shown below
Which operation is performed in the derivation of the
quadratic formula moving from Step 6 to Step 7?
Step 6: blanc = (x +
Step 7: 1/524 = x + more
subtracting
from both sides of the equation
squaring both sides of the equation
taking the square root of both sides of the equation
taking the square root of the discriminant

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.