Question

The factorisation of Z²-4z-12 is *


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Answer 1

Step-by-step explanation:

Z²-4z-12 = {Z²-2.Z.2+2²}-2²-12

=(Z-2)²-16

= (Z-2)²-4²

= {(Z-2)+4} {(Z-2)-4}

=(Z+2)(Z-6). (Ans)

Note: Using identity (a+b)(a-b) = a²-b²

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