1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
wariber [46]
4 years ago
10

Solve 3x2 + 18x + 15 = 0 by completing the square.

Mathematics
1 answer:
kondaur [170]4 years ago
3 0
<span>3x^2 + 18x + 15 = 0
15 + 18x + 3x2 = 0
3(5 + 6x + x2) = 0
</span>3((5 + x)(1 + x)) = 0
5 + x = 0
5 + -5 + x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + x = 0 + -5 x = 0 + -5
x = -5
<span>--------------------------------------------
1 + x = 0 x=-1
-5,-1 </span>
You might be interested in
Lara planted some seeds. For every 3 seeds Lara planted, only 2 seeds grew.
Tresset [83]

Given:

For every 3 seeds Lara planted, only 2 seeds grew.

Altogether, 12 seeds grew.

To find:

The number of total seeds planted by Lara.

Solution:

It is given that for every 3 seeds Lara planted, only 2 seeds grew. It means the ratio of total seeds planted to seeds grew is 3:2.

Altogether, 12 seeds grew.

Let x be the number of total seeds planted by Lara. Then,

x:12=3:2

\dfrac{x}{12}=\dfrac{3}{2}

x=\dfrac{3}{2}\times 12

x=18

Therefore, the total number of seeds planter by Lara is 18.

3 0
3 years ago
line a passes through the points(-4,-6) and (2,12) Library passes through the points (6,0) and (-4,20) find the point where line
Eddi Din [679]

Answer:


Step-by-step explanation:


8 0
3 years ago
Round 232.76 to 2 significant figures
lana [24]
So sig figs are non zero so

500 has 1 sig fig, 5
but 500. has 3 sig figs because it has a decimal

2.3 has 2 sig figs
2.03 has 3 sig figs so to make 232.76 to 2 sig figs you would put it into scientific notation and get 2.3 times 10^2 and thats 2 sig figs (the 10^2 doesn't count as a sig fig)
5 0
3 years ago
The region bounded by the given curve is rotated about the specified axis. find the volume v of the resulting solid by any metho
Blababa [14]
x^2+(y-2)^2=4\implies y=2\pm\sqrt{4-x^2}

describes a circle of radius 2 centered at (0,2). A revolution of this region about the y-axis would give you a sphere of radius 2, so the volume would be \dfrac43\pi\times2^3=\dfrac{32}3\pi.
4 0
3 years ago
4x - 7y = 3 <br> x - 7y = 15
charle [14.2K]
\left \{ {{4x-7y=3} \atop {x-7y=15}} \right. \\\\&#10; \left \{ {{4x-7y=3} \atop {x=15+7y}} \right. \\\\ substitution\ method\\\\&#10;4*(15+7y)-7y=3\\\\&#10;60+28y-7y=3\\\\&#10;60+21y=3\ \ \ \ | subtract\ \\\\&#10;21y=-57\\\\&#10;y=-\frac{57}{21}=-\frac{19}{7}\\\\&#10;x=15+7*(-\frac{19}{7})=15-19=-4\\\\\ Solution :\  \left \{ {{y=-\frac{19}{7}} \atop {x=-4}} \right.
5 0
4 years ago
Other questions:
  • When you add a positive number and a negative, how
    7·1 answer
  • The Aspire test includes a _____ to allow you to explore careers.
    8·1 answer
  • Lucy had her bithday party at Sweet Tooth Candy Shop. Each one of her guests ate 1/5 of a pound of chocolate. how many pounds of
    15·2 answers
  • Please quick problem :)
    9·1 answer
  • A box contains 19 large marbles and 18 small marbles. Each marble is either green or white. 9 of the large marbles are green, an
    7·1 answer
  • A study of the effect of exposure to color (red or blue) on the ability to solve puzzles used 42 subjects. Half the subjects (21
    6·1 answer
  • Arithmetic Geometric or Neither...
    10·1 answer
  • Please help please<br> A.68<br> B.39<br> C.73<br> D.107
    6·1 answer
  • Help me BRAINLES tysm​
    12·1 answer
  • 4x - 3 = 5 X=? can anyone tell me please
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!