Find all solutions of .
Answer and explanation
Correct answer: A.
- Step 1: Split into two cases: and .
- Step 2: These give and .
Answer
.
Why not the others: : Only the positive case was solved. : The signs of both solutions were reversed. : The constant was moved with the wrong sign.
Practise more Algebra, Linear Systems and Functions.
Free questions with an explanation for every one, and full timed Egyptian Scholastic Test (EST) mock tests.
More Algebra, Linear Systems and Functions questions
- If , what is the value of ?
- A line in the xy-plane passes through the points and . What is the slope-intercept equation of this line?
- Solve the system of equations for : \begin{cases} 2x + 3y = 12 \\ x - y = 1 \end{cases}
- If , what is the value of ?
- Which of the following functions has a graph that does NOT intersect the x-axis?
- If , what is the value of ?