book Maths Puzzle Numerical Ability

y=-x+2

x -2 -2 0 1 2
y

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book Other Question

Manipulate the equality a^2b^2(bc-a^2)+b^2c^2(ca-b^2)+c^2a^2(ab-c^2)=a^2b^2(b^2-ac)+b^2c^2(c^2-ab)+c^2a^2(a^2-bc) until the equality (a^2+b^2)(b^2+c^2)(c^2+a^2)=abc(a+b)(b+c)(c+a)i how do i find the minimized vertex for C=2x-4y?