Factorise :- 7 ( x - 2y )^2 - 25 ( x - 2y ) + 12

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Steven Clarke

London University

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Factorise :- 7 ( x - 2y )^2 - 25 ( x - 2y ) + 12

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Okay. This I want to characterize, I want to first, I will let this item here. Is the Z. Here and is he here? So we have seven Z square minus 25 Z last 12 and that I can get a bit more forwardly. So actualize that seven Z and Z make seven Z squared. No choice there two minus signs, no choice plus at the end. And then it could be 3, 4, 6, 2, 1, 12. And it's going to be in fact three here, four here. Yeah, I got 21 4 25. So seven Z -4 and Z -3. Then what you do Is we replace the Z by X -2 Y. So seven And then X -2, Y minus four, X -2, Y minus three. So we have seven X -14, Y minus four Times X -2 Y minus three. And that is the answer you need here.

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