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
Nikolay [14]
3 years ago
12

Solve the equation x2 + + 7x= 30

Mathematics
1 answer:
antiseptic1488 [7]3 years ago
8 0

Answer:

x^2+7x=30

x^2+7x-30=0

Here a=1,b=7 and c=-30

Now,

Discriminant(D)=b^2-4ac

=7^2-4×1×(-30)

=49+120=169

By applying Quadratic formula

x=-b+- root over b^2-4ac÷2a

=-7+- root over D ÷ 2×1

=-7 +- root over 169 ÷2

=-7 +- 13 ÷2

Now,

Either x=-7+13÷2=6÷2=3

Or x=-7 -13 ÷2=-20÷2=-10

Hence, ans is (C) x=-10 and x=3

You might be interested in
Graph the following inequality and then select the correct graph below. x + y < 1
saul85 [17]
First one!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!11111111111111111111111111111111111111
7 0
3 years ago
Read 2 more answers
HELP ME PLZ I NEED HELP BAD
ElenaW [278]

Answer:

mode: 2

median: 3

range is 9

6 0
3 years ago
Read 2 more answers
Why doesn't an elephant smoke?
snow_tiger [21]

Answer:

Because it can't

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
[20 pts] evaluate the logarithm log(6)1/36​, show work pls!
Delvig [45]

Answer:

\large\boxed{\log_6\dfrac{1}{36}=-2}

Step-by-step explanation:

\text{We know:}\\\\\log_ab=c\iff a^c=b\\\\\log_6\dfrac{1}{36}\qquad\text{use}\ a^{-1}=\dfrac{1}{a}\\\\=\log_636^{-1}=\log_6(6^2)^{-1}\qquad\text{use}\ (a^n)^m=a^{nm}\\\\=\log_66^{(2)(-1)}=\log_66^{-2}\qquad\text{use}\log_ab^n=n\log_ab\\\\=-2\log_66\qquad\text{use}\ \log_aa=1\\\\=-2(1)=-2

\log_6\dfrac{1}{36}=-2\ \text{because}\ 6^{-2}=\dfrac{1}{6^2}=\dfrac{1}{36}

8 0
3 years ago
A line with a slope of 1 passes through the point (0, 2)What is its equation in slope-intercept form?
devlian [24]

Answer:

y=x+2

Step-by-step explanation:

y-y1=m(x-x1)

y-2=1(x-0)

y-2=1(x)

y-2=x

y=x+2

5 0
3 years ago
Other questions:
  • Which type of lending Institution is being described?
    12·1 answer
  • " Pentagon ABCDE and pentagon A’B’C’D’E’ are shown on the coordinate plane below.
    6·2 answers
  • D. 16<br> Geometry math question
    12·2 answers
  • What is the range of the given function? {(–2, 0), (–4, –3), (2, –9), (0, 5), (–5, 7)}
    5·2 answers
  • It took James 5h to paint an 8ft by 24ft wall. At this rate, how long would it take him to paint a 12ft by 36ft wall
    7·1 answer
  • susan mountain elevation is 1530 meters. After 4 hours of climbing down to her elvationis 680 meters. What is susans avarge chan
    12·1 answer
  • Can you tell me the definition of the highlighted word please in your own words (Thank you)
    5·2 answers
  • It takes jackie 2 hours to make 9 bracelets how many bracelets can she make in 8 hour's?​
    5·2 answers
  • Derivative f(x) = arcsin (2x-1)
    6·1 answer
  • #
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!