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
BigorU [14]
2 years ago
5

Plz I need help with this ASAP

Mathematics
1 answer:
Oduvanchick [21]2 years ago
7 0

Answer:

x = 13  and  x = -3

Step-by-step explanation:

divide each side by 2 first and get:

(x-5)² = 64

take the square root of each side next and get:

x - 5 = \sqrt{64}

x - 5 = 8  and  x - 5 = -8

x = 13  and  x = -3

You might be interested in
Alice bought a book for $12. This is 80% of the original price. What was the original
devlian [24]

Answer: $2.40 and he saved $9.60 follows: $12 x . 80 = $9.60 savings

3 0
3 years ago
Solve The Equation <br> 4x×9y=7<br> 4x-9y=9
hoa [83]

Answer:

\large\boxed{x=\dfrac{9}{8}-\dfrac{\sqrt{109}}{8},\ y=-\dfrac{1}{2}-\dfrac{\sqrt{109}}{18}}\\or\\\boxed{x=\dfrac{9}{8}+\dfrac{\sqrt{109}}{2},\ y=-\dfrac{1}{2}+\dfrac{\sqrt{109}}{18}}

Step-by-step explanation:

\left\{\begin{array}{ccc}4x\times9y=7&(1)\\4x-9y=9&(2)\end{array}\right\\\\(2)\\4x-9y=9\qquad\text{subtract}\ 4x\ \text{from both sides}\\-9y=-4x+9\qquad\text{change the signs}\\9y=4x-9\qquad\text{substitute it to (1)}\\\\4x(4x-9)=7\qquad\text{use the distributive property}\ a(b+c)=ab+ac\\(4x)(4x)+(4x)(-9)=7\\(4x)^2-36x=7\\(4x)^2-2(4x)(4.5)=7\qquad\text{add}\ 4.5^2\ \text{to both sides}\\(4x)^2-2(4x)(4.5)+4.5^2=7+4.5^2\qquad\text{use}\ (a-b)^2=a^2-2ab+b^2

(4x-4.5)^2=7+20.25\\(4x-4.5)=27.25\to 4x-4.5=\pm\sqrt{27.25}\\\\4x-\dfrac{45}{10}=\pm\sqrt{\dfrac{2725}{100}}\\\\4x-\dfrac{45}{10}=\pm\dfrac{\sqrt{2725}}{\sqrt{100}}\\\\4x-\dfrac{45}{10}=\pm\dfrac{\sqrt{25\cdot109}}{10}\\\\4x-\dfrac{45}{10}=\pm\dfrac{\sqrt{25}\cdot\sqrt{109}}{10}\\\\4x-\dfrac{45}{10}=\pm\dfrac{5\sqrt{109}}{10}\qquad\text{add}\ \dfrac{45}{10}\ \text{to both sides}\\\\4x=\dfrac{45}{10}\pm\dfrac{5\sqrt{109}}{10}

4x=\dfrac{9}{2}\pm\dfrac{\sqrt{109}}{2}\qquad\text{divide both sides by 4}\\\\x=\dfrac{9}{8}\pm\dfrac{\sqrt{109}}{8}\\\\\text{Put the values of}\ x\ \text{to (2):}\\\\9y=4\left(\dfrac{9}{8}\pm\dfrac{\sqrt{109}}{8}\right)-9\\\\9y=\dfrac{9}{2}\pm\dfrac{\sqrt{109}}{2}-\dfrac{18}{2}\\\\9y=-\dfrac{9}{2}\pm\dfrac{\sqrt{109}}{2}\qquad\text{divide both sides by 9}\\\\y=-\dfrac{1}{2}\pm\dfrac{\sqrt{109}}{18}

8 0
3 years ago
What is 6x3/7 as a mixed number?
Anastaziya [24]
<span>6x3/7
6 x 3=18\7
answer=2 4\7</span>
6 0
3 years ago
Which is the better deal, 139.99 with 20 percent in discountor 139.99 with $20 in discount
Leno4ka [110]
20% discount is definitely the $ saver!
3 0
3 years ago
What is the least common denominator for the fractions1/6and 3/4 ?
melomori [17]
A. 12; Least common denominator is the least multiple that the denominator have together. So you multiply the denominators until you get the first number they both have in common.
6*1 = 6
6*2 =12

4*1 =4
4*2 =8
4*3 = 12 

Since the first number they both have in common is 12, the least common denominator is 12
3 0
3 years ago
Other questions:
  • 9.
    7·1 answer
  • How to find z statistic for test?
    5·1 answer
  • Determine which system below will produce infinitely many solutions.
    7·2 answers
  • 1+1<br> try to guess :) you will get 33 points
    5·2 answers
  • PLEASE HELP Which function represents a line with a slope of negative 4 and a y-intercept of negative 2
    15·1 answer
  • Solve for x. <br><br> x + 5 = 2x<br><br> x = 3<br> x = -3<br> x = -5<br> x = 5
    10·1 answer
  • A sprinter travels a distance of 200 m in a time of 20.03 seconds.
    10·1 answer
  • This is worth 15 points please help!
    12·1 answer
  • Solve pls brainliest
    12·2 answers
  • Find the discriminant of the following quadratic equation<br> x^-5x+3=0
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!