Eggs flour and sugar are mixed in the ratio of 3: 5: 4 by mass to make a cake. If the mass of the sugar is 240g find the mass of
1 answer:
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Use the formula for quadratic trinomial. Then you can form from a quadratic trinomial perfect square:
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From the last given step you have that
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Since 5·16=80, you can substitute the previous expression for perfect square into function expression and get:
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This means, when x=-4, f(-4)=-80 and vertex has coordinates (-4,-80).
Answer: correct choice is C.