Answer:
Distributive property
Step-by-step explanation:
see attached for reference
2 (x + 4)
= 2(x) + 2(4)
= 2x + 8
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1 answer:
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Answer:
C
Step-by-step explanation:
The terms form a geometric sequence with common ratio r
r = =
= ......
r = =
= -
The n th term formula of a geometric sequence is
= a
← a is the first term
here a = - 81, hence
f(x) = - 81 → C
Answers:
Equation is
Center is (-1, -2)
Radius = 5
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Work Shown:
center = (h,k) = (-1,-2)
radius = 5
-----------------------------
Explanation:
I grouped up the x and y terms separately. Then I added 1 to both sides to complete the square for the x terms. I cut the 2 from 2x in half, then squared it to get 1. In the next step, I cut the 4 from 4y in half to get 2, which squares to 4. So that's why I added 4 to both sides to complete the square for the y terms.
Each piece is factored using the perfect squares factoring rule which is a^2+2ab+b^2 = (a+b)^2
The last equation is in the form (x-h)^2 + (y-k)^2 = r^2
We can think of x+1 as x - (-1) to show that h = -1
Similarly, y+2 = y-(-2) = y-k to show that k = -2
The center is (h,k) = (-1,-2)
The radius is r = 5 because r^2 = 5^2 = 25 is on the right hand side in the last equation above.