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Please help and give an explanation. I have a test on this soon.

Please help and give an explanation. I have a test on this soon.-example-1
User Micka
by
7.6k points

1 Answer

6 votes

Answer:

(a) = 26.4 or (132/5); 0

(b) = 26.4 or (132/5); -220

(c) = 0; -220

(d) = 0

Explanation:

-5k²- 22k + 15

(a)

-5( -3/5 )² - 22( -3/5 ) + 15

-1.8 + 13.2 + 15 = 26.4 or

(-9/5) + (66/5) + 15 = (132/5)

I don't know if you do decimal points or fractions so I did both.

-5( -5 )² - 22( -5 ) + 15

-125 + 110 + 15 = 0

(b) -5 ( -3/5 )²- 22( -3/5 ) + 15

-1.8 + 13.2 + 15 = 26.4 or

(-9/5) + (66/5) + 15 = (132/5)

-5 ( 5 )²- 22( 5 ) + 15

-125 - 110 + 15 = -220

(c)

-5 ( 3/5 )²- 22( 3/5 ) + 15

-1.8 - 13.2 + 15 = 0 or

(-9/5) - (66/5) + 15 = 0

-5 ( 5 )²- 22( 5 ) + 15

-125 - 110 + 15 = -220

(d)

-5 ( 3/5 )²- 22( 3/5 ) + 15

-1.8 - 13.2 + 15 = 0 or

(-9/5) - (66/5) + 15 = 0

-5( -5 )² - 22( -5 ) + 15

-125 + 110 + 15 = 0

I hope this helps!

User Shawn Swaner
by
7.9k points

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