HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 279
Example 4 - hp40gs price
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hp40g+.book Page 5 Friday, December 9, 2005 1:03 AM Press to select the entire equation, then press to reduce it to 9x2 - 6x - 80 . Press , select FACTOR, press and then . The result is as shown at the right. Now press , select SOLVEVX, press and press . The result is shown at the right. Press to display CAS history, select D or a version of it, and press . Press , select SUBST, press and, then complete the second argument: x = -5 Press to select the entire expression and then to obtain the intermediate result shown. Press once more to yield the result: 175 . Therefore, D = 175 when x = -5 . Example 4 Step-by-Step Examples A baker produces two assortments of biscuits and macaroons. A packet of the first assortment contains 17 biscuits and 20 macaroons. A packet of the second assortment contains 10 biscuits and 25 macaroons. Both packets cost 90 cents. Calculate the price of one biscuit, and the price of one macaroon. Solution: Let x be the price of one biscuit, and y the price of one macaroon. The problem is to solve: 16-5