-7
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3x + 5x = 2x + 28x = 2x + 26x = 2x = (2/6) = 1/3
Discriminant = b2-4ac = (-2)2-(4*4*4) = -60
5x+2x-3y+y = (5+2)x+(-3+1)y = 7x - 2y
3x+2 = 5x so 2x = 2 and hence x = 2/2 = 1
20x2 + 22xy + 6y2 = 20x2 + 10xy + 12xy + 6y2 = 10x(2x + y) + 6y(2x + y) = (2x + y)(10x + 6y) = 2(2x + y)(5x + 3y)