What is the counterexample for the city of Portland is in Oregon

2 answers:

6 0

A counterexample is a special kind of example that disproves a statement or proposition. 

The counter example for : the city of Portland is in Oregon would be : the city of Portland is in Maine.

The city named Portland can be found in both states.

In-s [12.5K]3 years ago

4 0

One possible counterexample would be:

The city of Portland is in Connecticut.

Explanation:

A counterexample is something that proves a statement wrong. Since the city of Portland is in multiple states (Oregon, Maine, Connecticut, Arkansas, etc.), any of the other states having a Portland would serve as a counterexample.

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What are the solutions to the quadratic equation x^2-16=0

maks197457 [2]

Good evening.

This is a incomplete quadratic equation, because it does not have the term bx. Therefore, we can solve this faster with the following strategy:

$\mathsf{x^2 - 16 = 0}$

Add 16 to both sides:

$\mathsf{x^2 - 16 + 16 = 0 + 16}\\ \\ \mathsf{x^2 = 16}$

Take the square root:

$\mathsf{\sqrt {x^2} = \pm\sqrt{16}}\\ \\ \mathsf{\boxed{\mathsf{x = \pm4} }}$

Therefore:

$\boxed{\boxed{\mathsf{S=\{-4, \ +4\}}}}$

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