Question

Daca a-b=2 la-1, calculati 4a²+4b²-8ab-1

Answer 1

[tex]a-b=2^{-1} \\ 4a^{2}+4b^{2}-8ab-1=4(a^{2}+b^{2}-2ab)-1= \\ 4(a-b)^{2}-1=4*2^{-2}-1= \\ 4* \frac{1}{4} -1=1-1=0[/tex]