3 years ago

Joelle is working on a school report

Mathematics

1 answer:

-Dominant- [34]3 years ago

5 0

Answer:

Step-by-step explanation:

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Solve the following quadratic equation using the quadratic formula.

sdas [7]

$ax^2+bx+c=0\\\\\Delta=b^2-4ac\\\\x_1=\dfrac{-b-\sqrt\Delta}{2a};\ x_2=\dfrac{-b+\sqrt\Delta}{2a}$

<span> $5x^2-8x+5=0\to a=5;\ b=-8;\ c=5\\\\\Delta=(-8)^2-4\cdot5\cdot5=64-100=-36\\\\\sqrt\Delta=\sqrt{-36}=6i$

$x_1=\dfrac{-(-8)-6i}{2\cdot5}=\dfrac{8-6i}{10}=\dfrac{4-3i}{5}\\\\x_2=\dfrac{-(-8)+6i}{2\cdot5}=\dfrac{8+6i}{10}=\dfrac{4+3i}{5}$
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3 years ago

Read 2 more answers

A map scale is 1 inch:50 miles. Two cities are 450 miles apart. How far apart are the cities on the map

ArbitrLikvidat [17]

450÷50=9
Your answer would be 9inches because all you have to do is divide 450 by 50 and you get the number of inches

5 0

2 years ago

Proving the Converse of the Parallelogram Side Theorem

Brrunno [24]

Answer:

do it yourself

Step-by-step explanation:

6 0

2 years ago

Celeste started a new job with $500 in her account. after 50 hours of work, she deposits her pay check and she has $1500.

vovikov84 [41]

Answer:

$20 per hour

Step-by-step explanation:

1500 - 500 = 1000

1000 divided by 50 = 20

To check:

20 x 50 = 1000

7 0

2 years ago

To eliminate the y terms, you can multiply the first equation by 5 and the second equation by what number?

gladu [14]

Step-by-step explanation:

the second equation should be multiplied by 9

6 0

2 years ago