$(-x+3)(-x-3) = $   ?

$\,x^2 \,+ 9$ $\,x^2 \,- 9$ $\,x^2 \,- 6$ $\,x^2\, -6\,x\,+ 9$

$(9y+2x)^2 = $   ?

$81\,y^2\, +36\,x\,y\,+ 4\,x^2$ $9\,y^2\, +36\,x\,y\,+ 4\,x^2$ $81\,y^2\, +36y\,+ 4\,x^2$ $18\,y^2\, +36\,x\,y\,+ 4\,x^2$

$(7-y)^2 = $   ?

$49\, +14\,y\,+ \,y^2$ $49\, -14\,y\,+ \,y^2$ $14\, -14\,y\,+ \,y^2$ $49\, -7\,y\,+ \,y^2$

$(6+2y)^2 = $   ?

$36\, +24\,y\,+ 4\,y^2$ $36\, +12\,y\,+ 4\,y^2$ $12\, +24\,y\,+ 4\,y^2$ $36\,+ 4\,y^2$

$(-3+6y)(-3-6y) = $   ?

$9\, +36\,y\,+ 36\,y^2$ $9 \,- 36y$ $9 \,+ 36\,y^2$ $9 \,- 36\,y^2$

$(6-10x)^2 = $   ?

$36\, -120\,x\,+ 100\,x^2$ $36\, -60\,x\,+ 100\,x^2$ $12\, -120\,x\,+ 100\,x^2$ $36\, -120\,x\,+ 10\,x^2$