Question 323330
Use the FOIL method,
{{{(0.8x-0.1)(0.8x-0.1)=(0.8x)(0.8x)-(0.8x)(0.1)-(0.1)(0.8x)+(0.1)(0.1)}}}
{{{(0.8x-0.1)(0.8x-0.1)=0.64x^2-0.16x+0.01}}}