exam Maths Puzzle Numerical Ability

x^2-4-0 , 3x+x^2=0, x^2-10x+2=0 , 4x^2-16x=-16

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exam Other Question

Why is a quadratic equation called a quadratic? Quad means 4 and nothing in the equation has it. describe the graph of y^/25 - x^2/64 =1