$(10+11y)(10-11y) = $   ?

$100 \,- 22\,y^2$ $100 \,- 11\,y^2$ $100 \,- 121\,y^2$ $100 \,- 121y$

$(-11x+6y)(-11x-6y) = $   ?

$121\,x^2 \,- 6\,y^2$ $121\,x^2 \,- 12\,y^2$ $-121\,x^2 \,- 36\,y^2$ $121\,x^2 \,- 36\,y^2$

$(-11y-8x)^2 = $   ?

$121\,y^2\, +176\,x\,y\,+ 64\,x^2$ $121\,y^2\, +88\,x\,y\,+ 64\,x^2$ $-121\,y^2\, +176\,x\,y\,+ 64\,x^2$ $121\,y^2\, +176\,x\,y\,+ 16\,x^2$

$(8y+11x)^2 = $   ?

$64\,y^2\, +176\,x\,y\,+ 11\,x^2$ $64\,y^2\, -176\,x\,y\,+ 121\,x^2$ $64\,y^2\,+ 121\,x^2$ $64\,y^2\, +176\,x\,y\,+ 121\,x^2$

$(8-9y)^2 = $   ?

$64\, -72\,y\,+ 81\,y^2$ $64\, -144\,y\,+ 9\,y^2$ $64\, -144\,y\,+ 81\,y^2$ $64\, +144\,y\,+ 81\,y^2$

$(12+10y)^2 = $   ?

$24\, +240\,y\,+ 100\,y^2$ $144\, +240\,y\,+ 20\,y^2$ $144\, +240\,y\,+ 100\,y^2$ $144\, +120\,y\,+ 100\,y^2$