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tatiyna
3 years ago
10

What is the measure of DEF?

Mathematics
1 answer:
abruzzese [7]3 years ago
5 0

Answer:

66°

Subtract 78 - 12 = 66

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Which expression is equivalent to 18 − 20?
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The answer is 18+(-20) because if if you were going to solve that equation you would use the absolute value of -20 and then the opposite of the sign giving you 18-20. Hope this helps:)
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Factor completely 3x ^2 -27
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First, factor out a 3.
3(x² - 9)

In any quadratic ax² + bx + c, we can split the bx term up into two new terms which we want to equal the product of a and c.
In this case, we have x² + 0x - 9. (the 0x is a placeholder)
We want two numbers that add to 0 and multiply to get -9.
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Now we have 3(x² + 3x - 3x - 9).
Let's factor.
3(x(x+3)-3(x+3))
<u>3(x-3)(x+3)</u>

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Instead of splitting the middle, if your a value is 1, you can go straight to that step (x+number)(x+other number).
Whenever you have a difference of squares, like a²-b², that factors to (a+b)(a-b).
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3 years ago
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Please answer it’s 20 points for award!
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