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Zolol [24]
3 years ago
9

Subtract: (-14z^2+1)-(-13z^2)

Mathematics
2 answers:
Romashka [77]3 years ago
5 0
( - 14 {z}^{2} + 1) - ( - 13 {z}^{2} ) \\ = - 14 {z }^{2} + 1 + 13 {z}^{2} \\ = ( - 14 {z}^{2} + 13 {z}^{2} ) + 1 \\ = - {z}^{2} + 1
The answer is -z^2+1
sattari [20]3 years ago
4 0
I guest it is -z^2+1
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the complement of the question proposed one of the choices given beneath:
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as we observe at the figure, AOB an isosceles triangle, and OCB is a right triangle

consider OCB
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the problem is how to find the length of CA, for that C is a midpoint of segment AB, so AC=BC

BC can be found by using pythagorean theorem
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CB² = 28² - 9² = 784 - 81=703, therefore CB= sqrt (703)=26.51

CB=26.51, since CB= AC, so  AC=CB= 26.51

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the answer is b) 53.0

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