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Y and A Tutoring Paper 1 with Answers and Hints · Q2

Paper 1Algebra

The coefficient of x5x^5 in the binomial expansion of (kx2−2x+1)4(kx^2-2x+1)^4 is −32-32. Find all possible real values of the constant kk.

Ak=1 or k=−2k=1\text{ or }k=-2
Bk=12 or k=−3k=\frac12\text{ or }k=-3
Ck=43 or k=−1k=\frac43\text{ or }k=-1
Dk=2 or k=−13k=2\text{ or }k=-\frac13
Ek=23 or k=−2k=\frac23\text{ or }k=-2

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