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xmhllo
08.04.2020 •
Mathematics
Hunter and his children went into a grocery store and where they sell peaches for $1.75 each and mangos for $0.50 each. Hunter has $20 to spend and must buy at least 14 peaches and mangos altogether. Also, he must buy at least 4 peaches and no less than 12 mangos. If xx represents the number of peaches purchased and yy represents the number of mangos purchased, write and solve a system of inequalities graphically and determine one possible solution.
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Ответ:
the difference of two squares is a special form that has a factorization worth memorizing.
a² - b² = (a - b)(a + b)
your equation can be factored as
x² - 16 = 0
(x - 4)(x + 4) = 0
the zero product rule tells you the solutions are the values of x that make these factors zero: x=4, x=-4.