exam Maths Puzzle Numerical Ability

solve the equation using the specified function and the given values of the independent varible. simplify the result.
f(x)=x^2-2x
thank you for helping me. i dont know how to do this.

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exam Other Question

The formula to figuring the weight at different heights is w=Cr(neg squared). I know that C=1,570,536,900. If w=100 at sea level (r)=20,924,640 feet, how can w = 100? How do you Please help me :(

6(x+2)+4x=5x-23

Thank you.