Expand and simplify .
Answer and explanation
Correct answer: A.
- Step 1: Write it as .
- Step 2: Multiply: .
Answer
.
Why not the others: : This squares each term separately and misses the middle term. : This ignores the middle term and the negative sign. : This gets the sign of the last term wrong, since .
Practise more Algebra.
Free questions with an explanation for every one, and full timed GCSE English and Maths Resits (Grade 4) mock tests.