What is the coefficient of y in the expression 2 ⋅ 4 + 3y?
2 answers:
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Answer:
{ 4 }
Step-by-step explanation:
First you need to solve the equation. Then you need to write the solutions as a set.
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I like to use a graphing calculator to solve equations involving roots. That helps avoid extraneous solutions. Here, the graph of the left side intersects the graph of the right side at x=4. There is exactly one solution, so the solution set is ...
{ 4 }
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Solving this algebraically, you would isolate the radical, then "undo" it by squaring both sides of the equation. Then solve the resulting quadratic. That will have 2 solutions, only one of which will work in the original equation.
√(5x +16) -2 = 3x -8 . . . . given
√(5x +16) = 3x -6 . . . . . . add 2
5x +16 = (3x -6)^2 . . . . . square both sides
5x +16 = 9x^2 -36x +36 . . . . expand the square
9x^2 -41x +20 = 0 . . . . . . subtract (5x+16) to put into standard form
Factors of 9·20 = 180 that have a sum of 41 are 5 and 36, so we can rewrite this equation as ...
9x^2 -36x -5x +20 = 0
9x(x -4) -5(x -4) = 0 . . . . . . factor by pairs
(9x -5)(x -4) = 0
The values of x that make this equation true are the values that make the factors be zero: 5/9 and 4. Trying these in the equation, we find ...
√(5(5/9) +16) -2 = 13/3 -2 = 2 1/3 . . . . value of the left side for x = 5/9
3(5/9) -8 = -6 1/3 . . . . . . value of the right side for x=5/9; not the same
x = 5/9 is NOT A SOLUTION
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√(5(4)+16) -2 = √36 -2 = 4 . . . . value of the left side for x = 4
3(4) -8 = 12 -8 = 4 . . . . . . value of the right side for x=4. These are the same, so ...
x = 4 is a solution
The set of solutions is then ...
{ 4 } . . . . . solution set
Answer:
c
Step-by-step explanation:
if you plug in all the answers for x in answer c gives you the answer of f(x)=4
<h3>Answer: (x-2)(x-2)</h3>
This is the same as
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Explanation:
The middle coefficient is -4 and the last term is 4.
We need to find factors of the last term that add to the middle coefficient.
Here is a list of all ways to multiply two integers to get 4, and the sum of each pair of factors.
- -1 + (-4) = -5
- -2 + (-2) = -4
- 2 + 2 = 4
- 1 + 4 = 5
The second row of that list above is what we're after. So
-2 + (-2) = -4
-2 * (-2) = 4
Meaning the factorization is (x-2)(x-2). Note the "-2" values in each factor
We can use the FOIL rule or distribution to go from (x-2)(x-2) back to x^2-4x+4 to confirm the answer.