Quadratic expressions of the form a2 - b2 are known as the difference of two squares. They factor as follows,
. Factor the given expression.4x2 - 49
A. (2x + 7)2
B. (2x - 7)2
C. (2x + 7)(2x - 7)
D. prime
Answer: C
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Solve the absolute value equation.
= 
A. x = - 
, 
B. x = 
C. no solution
D. x = - 
, 9
Solve the problem.When an object is dropped to the ground from a height of h meters, the time it takes for the object to reach the ground is given by the equation t = 
, where t is measured in seconds. If an object falls 122.5 meters before it hits the ground, find the time it took for the object to fall.
A. 5 sec B. 25 sec C. 6 sec D. 8 sec
Solve the problem using your calculator.The paired data below consist of the test scores of 6 randomly selected students and the number of hours they studied for the test. Use a graphing calculator to model the data with a linear function that predicts a student's score as a function of the number of hours he or she studied.
A. y = 67.3 + 1.07x B. y = 33.7 - 2.14x C. y = -67.3 + 1.07x D. y = 33.7 +2.14x
Solve the equation. Express radicals in simplest form.n2 = -289
A. {-17} B. {17} C. {-17, 17} D. ?