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2 years ago

15

Jack thinks the ordered pairs below could be solutions to a linear equation,but Sally disagrees. Who is correct? Justify your an

swer algebraically

1 answer:

I am Lyosha [343]2 years ago

6 0

who is jack is that your crush?

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Solve 3x2 = −12x − 15.<br><br> x = −4 ± 2i<br> x = −4 ± i<br> x = −2 ± 2i<br> x = −2 ± i

diamong [38]

ANSWER

$x = - 2 \pm i$

EXPLANATION

We use the method of completing the squares.

The equation is
$3 {x}^{2} = - 12x - 15$

We rewrite the above equation to obtain;

$3 {x}^{2} + 12x = - 15$

We divide through by 3 to obtain;

${x}^{2} + 4x = - 5$

We add half the coefficient of
$x$

to both sides of the equation to get,

${x}^{2} + 4x + {2}^{2} = - 5 + {2}^{2}$

The right hand side is now a perfect square.

${(x + 2)}^{2} = - 1$

We now take square root of both sides to get;

$x + 2 = \pm \sqrt{ - 1}$

We add -2 to both sides,

$x = - 2 \pm \sqrt{ - 1}$

We simplify to obtain,

$x = - 2 \pm i$

3 0

2 years ago

What is 4 - ( -h ) = 68?

Kryger [21]

4 + h = 68

h = 68 - 4

h = 64

hope this helps

5 0

2 years ago

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A county has a population density of 257 people per square mile. The county population is 4288. What is the area of this county?

ladessa [460]

Answer:

The area of the country is 17 square miles

Step-by-step explanation:

To calculate the population density of the country. We employ the use of a mathematical formula. This can easily be obtained from the units of the density

The population density = Population of the country/area of the country

Since we are to calculate the area of the country, the equation becomes

Area of country = Population of country/population density of country

Area of country = 4288/257

Area of country = 16.68 square mile

To the nearest square mile, the Area of the country = 17 square mile

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2 years ago

100 points<br> whats 9 times 3 plus 3 divided by 2

Dmitrij [34]

Answer:

hi

Step-by-step explanation:

28.5

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Find the product. (do not use spaces in your answer.)<br><br> d ^j · d ^k

bezimeni [28]

$d^j\cdot d^k=d^{j+k}$

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2 years ago

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