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Alexus [3.1K]
4 years ago
13

Which expression is equivalent to x2 - 9?

Mathematics
2 answers:
Ber [7]4 years ago
8 0

Answer: C. (x-3)(x+3)

Step-by-step explanation: Since both terms are perfect squares, factor using the difference of squares formula a^2-b^2=(a+b)(a-b) where a=x and  b=3.

Hope this helps you out! ☺

kogti [31]4 years ago
3 0

Answer:

C

Step-by-step explanation:

x*x= x^2

-3*(+3)=-9

2x-9

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Find the value of the variable and BC, if B is between A and C.<br> AB = 5x, BC = 3x-1, AC = 47
schepotkina [342]

Answer:

17

Step-by-step explanation:

AC = AB + BC

Since we know what each variable equals, we can write out the equation as shown:

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Add 1 on both sides:

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Divide 8 on both sides:

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Now that we know what X equals, we can solve BC.

BC = 3(6) - 1

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BC = 17

Therefore BC = 17.

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