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Countinue
For starters, 
,
so 
,
which means that 
.
Since
and 
,
so that means that both x and y equal 2, right?
Wrong! Both x or y could be either 2 or -2, but we don't know which, so the relationship cannot be determined and the answer is Choice (4).
In the test-maker's favorite exponent trap you'll see a variable squared. The square of a number is positive, so the student assumes that the number is positive, when it could be positive or negative!
Don't forget: If 
,
that means that x could be 4 or - 4!
Next to display next topic in the chapter.
Test Prep Lessons With Video Lessons and Explained MCQ
Large number of solved practice MCQ with explanations. Video Lessons and 10 Fully explained Grand/Full Tests.
Each exam has different types of math sections. The sections may be called Mathematics or Arithmetic Problem Solving. In the math section of the exam, you will be tested on basic math skills such as addition, subtraction, multiplication, and division. Some sections may include fractions, decimals, graphs and percentages. All questions will be a multiple choice format. The amount of math questions on each test will vary.