book Maths Puzzle Numerical Ability

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(-6x^4+3x^2-16) + (4x^2+4x-7)

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please help me with this problem i think it's correct but not sure 1/2(550+x)/20=25 2/1x25/1=2/1x1/2(550+x)/20 50=550+x/20 20/1x50/1=550+x/20x20/1 1000=55 i have 3 points on a graph that form a triangle and i need to find the area of the triangle using a matrix. How would i find the area? the points are (-2,-2), (3,0), and (2,4).