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Goshia [24]
3 years ago
9

In 15 and 16, use the expression 1 + z/3 + 2w

Mathematics
1 answer:
stiks02 [169]3 years ago
7 0
Dang I’m dumb byeee use photo math it’s a app
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Prove Forall x elementof Z, x^2 - 5x - 1 is odd.
Diano4ka-milaya [45]

Answer with Step-by-step explanation:

Let Z be a set of integers

We have to prove that x^2-5x-1 is odd for all value of x \inZ.

There are two cases

1.When x is an odd integer number

2.when x is even integer number

1.When x is an odd integer  number

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-5x -1 = -even number

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When x is negative odd number

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Therefore,odd number + odd number -1=Even  number -1=Odd number

Hence x^2-5x-1 is an odd number.

2.When  x is an even number

When x is positive even number

x square is positive even number  and 5x is positive even number

Even number -Even number -1 =Even number -odd number =Odd number

Suppose x=4

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