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3 years ago

6

Nick thought of a counting number, and then he added the next counting number to it. He got the sum of 79. What was Nick's numbe

r?

1 answer:

77julia77 [94]3 years ago

4 0

X + x+1 = 79
2x + 1 - 1 = 79 - 1
2x = 78
2x/2 = 78/2
x=39
Nick's number was 39

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EXPLANATION

The given quadratic equation is

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This is the same as,

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Using the quadratic formula, the solution is given by:

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We substitute the values to get,

$x = \frac{ - 3\pm \: \sqrt{ {3}^{2} - 4(2)( - 8)} }{2(2)}$

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