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Home » Chain Reaction – Level 1 – Hard

Each answer you find is used inside the next question. Work through the full chain carefully – if you get one wrong, it affects the rest!

Read more about how to solve these puzzles here

Your Workings For Chain Reaction

1) Solve: (x + 3)² – (2x – 1)(x – 2) = 22 + (x)(x) + 6x – 2×2

A =

2) Use your answer from Q1 as “a”. Now solve: (a + x)(x – 1)(x + 9) = 33 + x3 + 11×2

B =

3) Use your answer from Q2 as “b”. Find the coefficient of x in the expansion of: (x + b)(x + 4)

C =

4) Use your answer from Q3 as “c”. Solve: 2x² – cx + 9 = 7 + 2x(x – 4) + x

D =

5) Use your answer from Q4 as “d”. Factorise: x² – 6dx + 20

E =

Reveal the Answer

Answer:

(x – 2)(x – 10)