If and are the roots of , find .

Answer and explanation

Correct answer: B. 9

  1. Step 1: For the sum of roots is and the product is .
  2. Step 2: Here , , , so the sum is .
Answer
9.
Why not the others: -9: the sign is reversed. 18: it doubles the result.

Practise more Number and Algebra.

Free questions with an explanation for every one, and full timed Junior Cycle (Ireland) mock tests.

All Number and Algebra questionsTake a mock test

More Number and Algebra questions