3 years ago

2 times the sum of a number and 9 equals 4

Mathematics

1 answer:

ratelena [41]3 years ago

4 0

Answer

Step-by-step explanation:

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We have the expressions:

$f(x)=x^2+6x+15$ $y=x^2-4x+9$ $f(x)=x^2-8x$ $y=x^2+7x-2$

Now, with this we operate as follows:

$f(x)=x^2+6x+15=x^2+6x+9+15-9$ $\Rightarrow(x+3)^2+6$

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$y=x^2-4x+9=x^2-4x+4+9-4$ $\Rightarrow(x-2)^2+5$

Then, the vertex is (2, 5) and the axis is x = 2.

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$y=x^2+7x-2=x^2+7x+\frac{49}{4}-2-\frac{49}{4}$ $\Rightarrow(x+\frac{7}{2})^2-\frac{57}{4}$

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1 year ago

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3 years ago

2 times the sum of a number and 9 equals 4​

2 times the sum of a number and 9 equals 4