Answer
453k+ views
Hint: Here we go through by breaking the exponents into two terms i.e. by writing ${2^{2x + 1}} = 2 \cdot {2^{2x}}$ and ${2^{x - 1}} = \dfrac{{{2^x}}}{2}$then let the term ${2^x}$ as t and form the quadratic equation. By solving the quadratic equation we find the value of t after that equate with ${2^x}$to get the answer.
Complete step-by-step answer:
${2^{2x + 1}} - 33 \cdot {2^{x - 1}} + 4 = 0$
Now break the terms ${2^{2x + 1}} = 2 \cdot {2^{2x}}$and ${2^{x - 1}} = \dfrac{{{2^x}}}{2}$ as we know the rule of exponents i.e.${a^m} \cdot {a^n} = {a^{m + n}}$ and \[{a^{m - n}} = \dfrac{{{a^m}}}{{{a^n}}}\].
Now we write it as,
now let the term ${2^x}$ as t.
$2{t^2} - \dfrac{{33}}{2}t + 4 = 0$ here we see that it is forming a quadratic equation.
$4{t^2} - 33t + 8 = 0$
Now we have to make it in factor form.
$4{t^2} - 32t - t + 8 = 0$
$4t\left( {t - 8} \right) - 1\left( {t - 8} \right) = 0$
$
\left( {t - 8} \right)\left( {4t - 1} \right) = 0 \\
\therefore t = 8,t = \dfrac{1}{4} \\
$
Now as we have assumed ${2^x} = t$
So, ${2^x} = 8 \Rightarrow \therefore x = 3$ or ${2^x} = \dfrac{1}{4} \Rightarrow \therefore x = - 2$
Hence x=3 and x= -2 are the required answer.
Note: For solving this type of question you have to use the concept of exponent and to solve it further consider an exponent as a variable then it may become a quadratic equation as in this question and then you can solve it easily.
Complete step-by-step answer:
${2^{2x + 1}} - 33 \cdot {2^{x - 1}} + 4 = 0$
Now break the terms ${2^{2x + 1}} = 2 \cdot {2^{2x}}$and ${2^{x - 1}} = \dfrac{{{2^x}}}{2}$ as we know the rule of exponents i.e.${a^m} \cdot {a^n} = {a^{m + n}}$ and \[{a^{m - n}} = \dfrac{{{a^m}}}{{{a^n}}}\].
Now we write it as,
now let the term ${2^x}$ as t.
$2{t^2} - \dfrac{{33}}{2}t + 4 = 0$ here we see that it is forming a quadratic equation.
$4{t^2} - 33t + 8 = 0$
Now we have to make it in factor form.
$4{t^2} - 32t - t + 8 = 0$
$4t\left( {t - 8} \right) - 1\left( {t - 8} \right) = 0$
$
\left( {t - 8} \right)\left( {4t - 1} \right) = 0 \\
\therefore t = 8,t = \dfrac{1}{4} \\
$
Now as we have assumed ${2^x} = t$
So, ${2^x} = 8 \Rightarrow \therefore x = 3$ or ${2^x} = \dfrac{1}{4} \Rightarrow \therefore x = - 2$
Hence x=3 and x= -2 are the required answer.
Note: For solving this type of question you have to use the concept of exponent and to solve it further consider an exponent as a variable then it may become a quadratic equation as in this question and then you can solve it easily.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Why Are Noble Gases NonReactive class 11 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let X and Y be the sets of all positive divisors of class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x and y be 2 real numbers which satisfy the equations class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x 4log 2sqrt 9k 1 + 7 and y dfrac132log 2sqrt5 class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x22ax+b20 and x22bx+a20 be two equations Then the class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
At which age domestication of animals started A Neolithic class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Which are the Top 10 Largest Countries of the World?
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give 10 examples for herbs , shrubs , climbers , creepers
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference Between Plant Cell and Animal Cell
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Write a letter to the principal requesting him to grant class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Change the following sentences into negative and interrogative class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Fill in the blanks A 1 lakh ten thousand B 1 million class 9 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)