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vitfil [10]
3 years ago
6

Find x so the distance between (x,4) and (2x-4,-5) is 15

Mathematics
1 answer:
marshall27 [118]3 years ago
6 0
(2x-4-x)^2 + (-5-4)^2 = 15^2\\ 
(x-4)^2 + (-9)^2 = 225\\
x^2 - 8x + 16 + 81 - 225 = 0\\
x^2 - 8x -128 = 0\\
x= \frac{8б \sqrt{(-8)^2-4*1*(-128)} }{2}=\frac{8б \sqrt{576} }{2}= \frac{8б 24 }{2}= \frac{2(4б 12) }{2}= 4б12 \\ x_1=4-12=-8 \\ x_2=4+12=16
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There are 625 different 4-digit codes only made with odd numbers.

<h3></h3><h3>How many different combinations can you make?</h3>

To find the total number of combinations, we need to find the number of options for each one of the digits.

There are 4 digits, such that each digit can only be an odd number.

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