If , find .

Answer and explanation

Correct answer: B. 20

  1. Step 1: Substitute : .
  2. Step 2: .
Answer
20.
Why not the others: 8: the sign of the middle term is mishandled. 68: is squared along with - the coefficient should not be squared. 12: is not squared.

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