exam Maths Puzzle Numerical Ability

How do you detemine the range of the function y=-2x+x when the domain is {1,3,5}

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exam Other Question

I have this problem and I need to solve it using Identies, but it also has restrictions such as theta is more than or equal to zero and theta is less than or equal to 360 the equation is this 4cos(squared, theta)-1=0 I would like some help with this problem Thanks
Find the value of x

3+x-2(-4)=7-(-13)