Darlene wrote this proof of the identity (x+y)^2-(x-y)^2=4xy. Which of the following is a justification for step 5 for her proof
?
a. definition of a squaring a binomial
b. distributive property
c combining like terms
d. reflective property
a. definition of a squaring a binomial
b. distributive property
c combining like terms
d. reflective property
2 answers:
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The equation of a circle exists:
, where (h, k) be the center.
The center of the circle exists at (16, 30).
<h3>What is the equation of a circle?</h3>
Let, the equation of a circle exists:
, where (h, k) be the center.
We rewrite the equation and set them equal :
We solve for each coefficient meaning if the term on the LHS contains an x then its coefficient exists exactly as the one on the RHS containing the x or y.
-2hx = -32x
h = -32/-2
⇒ h = 16.
-2ky = -60y
k = -60/-2
⇒ k = 30.
The center of the circle exists at (16, 30).
To learn more about center of the circle refer to:
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