Please see the attached photo q15
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Step-by-step explanation:
x-a*x-b = x^2 +(a+b)x + ab = x^2-2x-1
a+b = -2, ab=-1
(x-2a+1)*(x-2b+1) = x^2 + (-2a+1-2b+1)x + 4ab-2a-2b + 1
= x^2 - 2(a+b-1)x + 4ab -2(a+b) + 1
= x^2 + 6x + 1
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