how does from below third step
x2-4x+4+25=x2×4x+4+81
comes???
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Step-by-step explanation:
=(x-2)²+25 = (x+2)²+81
=(x-2)(x-2)+25 = (x+2)(x+2)+81
=x(x-2)-2(x-2)+25 = x(x+2)+2(x+2)+81
=x²-2x-2x+4+25 = x²+2x+2x+4+81
=x²-4x+4+25 = x²+4x+4+81
...........
hope it helps nark as brilliant
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