Calculate , where .
Answer and explanation
Correct answer: B.
- Step 1: Expand: . Step 2. Since this equals . **Answer: . Why not the others:** adds the two numbers instead of multiplying, treats as , and makes a sign mistake in the middle terms.
Practise more Algebra, Functions, Geometry and Probability.
Free questions with an explanation for every one, and full timed Državna Matura (Montenegro) mock tests.