
Now completing the square.

(x+5)² = 16 is the rewritten equation... For first question btw.
For the solutions to the equation -

x = -1,-9 is the solution, for the second question.
I think the answer is choice D, but don't trust me I didn't do the math.
Diameter = 2 × radius
radius= 43 CM
diameter= 2× 43 CM
diameter= 86 CM
<span>rotated 90° about the origin
(x,y) = (-y, x)
so </span><span>(5, -2) is rotated 90° about the origin = (2, 5)
answer
</span><span>b.(2, 5)</span>