Finding an Elementary Matrix In Exercises 9 - 12 , let A , B , and C be A = 1 2 - 3 0 1 2 - 1 2 0 , B = - 1 2 0 0 1 2 1 2 - 3 , and C = 0 4 - 3 0 1 2 - 1 2 0 . Find an elementary matrix E such that E C = A .
Finding an Elementary Matrix In Exercises 9 - 12 , let A , B , and C be A = 1 2 - 3 0 1 2 - 1 2 0 , B = - 1 2 0 0 1 2 1 2 - 3 , and C = 0 4 - 3 0 1 2 - 1 2 0 . Find an elementary matrix E such that E C = A .
Solution Summary: The author explains how to find an elementary matrix E by using EC=A.
M = log
The formula
determines the magnitude of an earthquake,
where / is the intensity of the earthquake and S is the intensity of
a "standard earthquake." How many times stronger is an
earthquake with a magnitude of 8 than an earthquake with a
magnitude of 6? Show your work.
Now consider equations of the form ×-a=v
= √bx + c, where a, b, and c
are all positive integers and b>1.
(f) Create an equation of this form that has 7 as a solution and
an extraneous solution. Give the extraneous solution.
(g)
What must be true about the value of bx + c to ensure that
there is a real number solution to the equation? Explain.
The equation ×+ 2 = √3x+10 is of the form ×+ a = √bx + c, where a, b, and
c are all positive integers and b > 1. Using this equation as a
model, create your own equation that has extraneous solutions.
(d) Using trial and error with numbers for a, b, and c, create an
equation of the form x + a = √bx + c, where a, b, and c are all
positive integers and b>1 such that 7 is a solution and there
is an extraneous solution. (Hint: Substitute 7 for x, and
choose a value for a. Then square both sides so you can
choose a, b, and c that will make the equation true.)
(e) Solve the equation you created in Part 2a.
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