`(-37) + 6 = ? `

If x^(2) + y^(2) =37 and xy = 6 : find x-y

If x^(2) + y^(2) = 37 and xy = 6, find x+y

If x^(2) + y^(2) = 37 and xy = 6, find x^(2) - y^(2)

Direction: What value should come in place of question mark (?) in the following questions? 11^2 + 6^2 = ? + 37

If 56 xx 11 = 9 , 37 xx 13 = 6 , 42 xx 12 = 3 , then find the value of 87 xx 77 .

If A=[(1,4,2),(2,-1,4),(-3,7,-6)] then A has

Show that the point A(3,7) B(6,5) and C(5,-1) are collinear.