If ( 5 + 2?3 ) / ( 7 + 4?3 ) = a + b?3, then the value of a and b is?

Correct Answer: 64

Explanation:

?5 + ?x = 3
Apply the law of Algebra Law.
Square both side of equation.
(?5 + ?x)² = 3²
? 5 + ?x = 9
? ?x = 9 - 5
? ?x = 4
Now cube the both side of equation,
? ( ?x ) ³ = 4³
? x = (4)³
? x = 64

Correct Answer: 7.1

Explanation:

81^2.5 X 9^4.5 ÷ 3^4.8 = 9^?
? 81^2.5 x 9^4.5 ÷ 3^4.8 = 9^?
Apply the law of Fractional Exponents and Laws of Exponents
(a^m)ⁿ = a^{m x n} ----------------1
(a^m) x (aⁿ) = a^{m + n}-------------2
a^m ÷ aⁿ = a^{m ? n}----------------3
and if p^X = p^Y then X will be equal to Y. means X = Y;----------------4

Apply Law 1
? (9²)^2.5 x 9^4.5 ÷ 3^{2 x 2.4} = 9^?
? 9⁵ x 9^4.5 ÷ 9^2.4 = 9^?
Apply law 2 and 3,
? 9^{(5 + 4.5 - 2.4)} = 9^?
? 9^? = 9^7.1
Apply the Law 4
? ? = 7.1

Correct Answer: 458

Explanation:

Given that, (42 x 229) ÷ (9261)^1/3 = ?
As we know that (9621)^1/3 = (21 x 21 x 21)^1/3 = 21^3x1/3
? 42 x 229 ÷ (21^{3 x} )^1/3 = ?
? 42 x 229 ÷ 21 = ?
? 42 x 229 x 1/ 21 = ?
? 2 x 229 = ?
? ? = 2 x 229
? ? = 458

Correct Answer: 3, 2

Explanation:

Apply the law of Fractional Exponents and Laws of Exponents
(a^m) x (aⁿ) = a^{m + n}
a^-m = 1/a^m
p⁰ = 1
and if p^X = p^Y then X will be equal to Y. means X = Y;
(a^m)ⁿ = a^{m x n}
(a^m) x (aⁿ) = a^{m + n}
a^m ÷ aⁿ = a^{m ? n}
Or
a^m/aⁿ = a^{m ? n}

Given equation is
2^p + 3^q = 17 ----------------(i)
2^{p + 2} - 3^{q + 1} = 5
? 2^p x 2² - 3^q x 3 = 5
? 2^p x 4 - 3q x 3 = 5
? 4 x 2^p - 3 x 3q = 5---------------(ii)
On multiplying Eq. (i) by 3 and adding it, with Eq. (ii), we get

3 x 2^p + 3 x 3^q = 51
4 x 2^p - 3 x 3^q = 5
_____________________________
7 x 2^p = 56

? 7 x 2^p = 7 x 8
? 2^p = 8
? 2^p = 2³
? p = 3

On substituting the value of p in Eq. (i) . we get
2³ + 3^q = 17
? 8 + 3^q = 17
? 3^q = 17 - 8
? 3^q = 9
? 3^q = 3²
? q = 2

Correct Answer: L

Explanation:

^L?3 = M^1/L = Surd of L^th order.

Correct Answer: a real number but not a rational number

Explanation:

Given expression = [(?2)^?2]^?2
= (?2)^(2)?2/2
= (?2)^(2)1/?2
= (2)^1/2 x 2^1/?2
= 2^(2/21/?2)
= (2)^{(2)(1/?2 - 1)}
which denotes a real number but not a rational number .

Correct Answer: 9/10ac-1

Explanation:

Given equation is,
( 6a^-2bc^-3/4ab^-3c² ) ÷ ( 5a^-3 b²c^-1/3ab^-2c³ )
Apply the algebra law a ÷ b = a x 1/b
= ( 6a^-2bc^-3/4ab^-3c² ) x ( 3ab^-2c³/5a^-3 b²c^-1 )
= ( 6a^-2 bc^-3 x 3ab^-2c³) / ( 4ab^-3c² x 5a^-3b²c^-1 )
Apply the law of Fractional Exponents and Laws of Exponents
(a^m)(aⁿ) = a^m+n
a^m÷aⁿ=a^m-n
Or
a^m/aⁿ=a^m-n
= 18a^{-2 + 1} b^{1 - 2} c ^{-3 + 3} / 20a^{1 - 3} b^{-3 + 2} c^{2 - 1}
= 9a^-1b^-1c⁰/ 10a ^{- 2} b^-1c¹
= ( 9/10 ) a^{-1 + 2}b^{-1 + 1} c^{0 - 1}
= ( 9/10 ) a¹b⁰ c^-1
= ( 9/10 ) ac^-1 [? b⁰ = 1]

Correct Answer: 27

Explanation:

Correct Answer: 15 8

Explanation:

Correct Answer: 25