exam Maths Puzzle Numerical Ability

Simplify the product : (x/2-2/5)(2/5-x/2)-x^2+2x

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exam Other Question

STATE THE DOMAIN AND RANGEOF THE RELATION
{(3,2),(-5,7),(-4,3)
D=
R= All variables are real numbers - express in simplified form

square root of 14xy^2 multiplied by the square root of 3xy^3