Paper 2 · Algebra, factorising, equations
Factorise completely 3x²-147.
A3(x-7)(x+7)
B3(x-49)(x+3)
C(3x-7)(x+21)
D3(x-7)²
Explanation: 3x²-147=3(x²-49)=3(x-7)(x+7).
Derived from ZIMSEC Mathematics Paper 2, November 1999, Q2
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