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Scorpion4ik [409]
4 years ago
7

Carter writes the expression for the area of a deck with a width of r + 4 and a length or r - 5. He made an error when using the

distributive property in the work shown. What was Carters error?
(r + 4)(r - 5)
r^2 + 4r - 5r + 20
r^2 - r + 20

Mathematics
1 answer:
seropon [69]4 years ago
8 0
He didn’t combine the -5r + 4r correctly and also he didn’t multiply 4 and -5 correctly.

if you can show your work. use
F O I L method
first
outer
inner
last.

r • r = r^2

r • -5 = -5r

r• 4 = 4r

4• -5 = -20.


the final equation is


R^2 + r -20

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jek_recluse [69]

Answer:

(0, -3)

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Here we'll rewrite x^2+y^2+6y-72=0 using "completing the square."

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x^2 is already a perfect square.  Focus on rewriting y^2 + 6y as the square of a binomial:  y^2 + 6y becomes a perfect square if we add 9 and then subtract 9:

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The center of the circle is (h, k), or (0, -3).

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