$(2y-8x)^2 = $   ?

$2\,y^2\, -32\,x\,y\,+ 64\,x^2$ $4\,y^2\,- 64\,x^2$ $4\,y^2\, -32\,x\,y\,+ 64\,x^2$ $4\,y^2\, -16\,x\,y\,+ 64\,x^2$

$(5y-5x)^2 = $   ?

$10\,y^2\, -50\,x\,y\,+ 25\,x^2$ $25\,y^2\, -50\,x\,y\,+ 25\,x^2$ $5\,y^2\, -50\,x\,y\,+ 25\,x^2$ $25\,y^2\, -50\,x\,y\,+ 10\,x^2$

$(9+11x)(9-11x) = $   ?

$81\, +198\,x\,+ 121\,x^2$ $81 \,- 22\,x^2$ $81 \,- 121\,x^2$ $9 \,- 121\,x^2$

$(3x+3)^2 = $   ?

$9\,x^2\, +18\,x\,+ 3$ $9\,x^2\,+ 9$ $3\,x^2\, +18\,x\,+ 9$ $9\,x^2\, +18\,x\,+ 9$

$(7y+3)(7y-3) = $   ?

$49\,y^2 \,- 6$ $49\,y^2 \,+ 9$ $49\,y^2 \,- 9$ $14\,y^2 \,- 9$

$(-7+x)^2 = $   ?

$49\, -14\,x\,+ 2\,x^2$ $49\, -14\,x\,+ \,x^2$ $49\, +14\,x\,+ \,x^2$ $49\,+ \,x^2$