I need a little help with b) ii. http://img10.imageshack.us/img10/1038/73... Answers to previous questions a) i A=y(8+x)-x^2 ii P=2x+2y+16 b) i A=192+16x-2x^2 Thanks
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Originally Posted by user_5 I need a little help with b) ii. http://img10.imageshack.us/img10/1038/73... Answers to previous questions a) i A=y(8+x)-x^2 ii P=2x+2y+16 b) i A=192+16x-2x^2 Thanks Simply solve equation b) for x, and those are the allowable x values. Quadratic formula.
Solving for x using the quadratic formula gives. Whereas the answer is 0<x<12
Originally Posted by user_5 Solving for x using the quadratic formula gives. Whereas the answer is 0<x<12 Since P = 64 you have y = 24 - x. Also, from the diagram it's clear that you require . These two things can only happen if . And since is satisfied for these values of x, is the answer.
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