1. Simplify (5 - 21) (2 + 6i) - (4-1) Step by step
1 answer:
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Answer:
Identity (a) can be re-written as
which we already proven in another question, while for idenity (b)
step A is simply expressing each function in terms of sine and cosine.
step B is adding the terms on the LHS while multiplying the one on RHS.
step C is replacing the term on the numerator with the equivalent from the pithagorean identity
ANSWER
D) 10
EXPLANATION
We want to solve the radical equation,
Square both sides,
Expand brackets on right hand side,
Rewrite in general quadratic equation form,
Factor to obtain,
Apply the zero product principle to get,
We put n=2 into the equation to get,
This statement is false, hence 2 is an extraneous solution
We put n=10, to get
This is true, hence the only solution is
D) 10
EXPLANATION
We want to solve the radical equation,
Square both sides,
Expand brackets on right hand side,
Rewrite in general quadratic equation form,
Factor to obtain,
Apply the zero product principle to get,
We put n=2 into the equation to get,
This statement is false, hence 2 is an extraneous solution
We put n=10, to get
This is true, hence the only solution is