exam Maths Puzzle Numerical Ability

i need to differentiate y= -2x�+4x+7

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exam Other Question

Find the real number restrictions on x in the expression:

x^2/x^2-14x+49 Complete the square and write the equation in standard form. Then give the center and radius of the circle.
x2 + y2 - 2x - 4y - 4 = 0