EXAMPLE 5 Find a counterexample

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Presentation transcript:

EXAMPLE 5 Find a counterexample A student makes the following conjecture about the sum of two numbers. Find a counterexample to disprove the student’s conjecture. Conjecture: The sum of two numbers is always greater than the larger number. SOLUTION To find a counterexample, you need to find a sum that is less than the larger number.

EXAMPLE 5 Find a counterexample –2 + –3 = –5 –5 > –2 Because a counterexample exists, the conjecture is false. ANSWER

EXAMPLE 6 Standardized Test Practice

EXAMPLE 6 Standardized Test Practice SOLUTION Choices A and C can be eliminated because they refer to facts not presented by the graph. Choice B is a reasonable conjecture because the graph shows an increase from 1990–2001, but does not give any reasons for that increase. The correct answer is B. ANSWER

( )2 GUIDED PRACTICE for Examples 5 and 6 5. Find a counterexample to show that the following conjecture is false. Conjecture: The value of x2 is always greater than the value of x. 12 ( )2 = 14 14 > 12 Because a counterexample exist, the conjecture is false ANSWER

GUIDED PRACTICE for Examples 5 and 6 6. Use the graph in Example 6 to make a conjecture that could be true. Give an explanation that supports your reasoning. Conjecture: The number of girls playing soccer in the year 2002 will increase over previous years; the number of girls participate in soccer has increased for the past 11 years. ANSWER