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USPshnik [31]
3 years ago
12

(x +y)(x-y), ifx= -3, y=-5

Mathematics
2 answers:
Rufina [12.5K]3 years ago
5 0

Answer:

-16

Step-by-step explanation:

(-3 + (-5))(-3 - (-5))

(-3 - 5)(-3 + 5)

(-8)*2

<u>-16</u>

ozzi3 years ago
5 0
It’s -16

(-3+(-5))(-3-(-5))
(-8)(2)
-16
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Factor by completing the square 5x^2-21=10x
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Solve for x over the real numbers:
5 x^2 - 21 = 10 x

Subtract 10 x from both sides:
5 x^2 - 10 x - 21 = 0

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x^2 - 2 x - 21/5 = 0

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Write the left hand side as a square:
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Add 1 to both sides:
Answer:  x = 1 + sqrt(26/5) or x = 1 - sqrt(26/5)
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