Ravi Kant Kumar

Solve 2^(5x)/2^x = 5th root of 2^20 Solve: \(\frac{2^{5x}}{2^x} = \sqrt[5]{2^{20}}\) Solution \[ \frac{2^{5x}}{2^x} = \sqrt[5]{2^{20}} \] \[ = 2^{5x-x} = (2^{20})^{1/5} \] \[ = 2^{4x} = 2^4 \] \[ \Rightarrow 4x = 4 \] \[ \Rightarrow x = 1 \] Final Answer: \[ \boxed{x = 1} \] Next Question / Full Exercise

Solve 27^x = 9 / 3^x Solve: \(27^x = \frac{9}{3^x}\) Solution \[ 27 = 3^3,\quad 9 = 3^2 \] \[ (3^3)^x = \frac{3^2}{3^x} \] \[ 3^{3x} = 3^{2-x} \] \[ \Rightarrow 3x = 2 – x \] \[ \Rightarrow 4x = 2 \] \[ \Rightarrow x = \frac{1}{2} \] Final Answer: \[ \boxed{x = \frac{1}{2}}

Proof of exponent identity Prove: \[ \left(\frac{3^a}{3^b}\right)^{a+b} \left(\frac{3^b}{3^c}\right)^{b+c} \left(\frac{3^c}{3^a}\right)^{c+a} = 1 \] Proof \[ = (3^{a-b})^{a+b}(3^{b-c})^{b+c}(3^{c-a})^{c+a} \] \[ = 3^{(a-b)(a+b) + (b-c)(b+c) + (c-a)(c+a)} \] \[ = 3^{(a^2-b^2)+(b^2-c^2)+(c^2-a^2)} \] \[ = 3^0 \] \[ = 1 \] Hence Proved Next Question / Full Exercise

Proof of exponent identity Prove: \[ (x^{a-b})^{a+b}(x^{b-c})^{b+c}(x^{c-a})^{c+a} = 1 \] Proof \[ = x^{(a-b)(a+b)} \cdot x^{(b-c)(b+c)} \cdot x^{(c-a)(c+a)} \] \[ = x^{(a^2-b^2) + (b^2-c^2) + (c^2-a^2)} \] \[ = x^0 \] \[ = 1 \] Hence Proved Next Question / Full Exercise

Simplify (1^3 + 2^3 + 3^3)^(1/2) Simplify: \((1^3 + 2^3 + 3^3)^{1/2}\) Solution \[ = (1 + 8 + 27)^{1/2} \] \[ = (36)^{1/2} \] \[ = 6 \] Final Answer: \[ \boxed{6} \] Next Question / Full Exercise

Simplify 64^(-1/3)(64^(1/3) – 64^(2/3)) Simplify: \(64^{-1/3}(64^{1/3} – 64^{2/3})\) Solution \[ 64 = 4^3 \Rightarrow 64^{1/3} = 4 \] \[ = 64^{-1/3}(4 – 16) \] \[ = \frac{1}{4} \cdot (-12) \] \[ = -3 \] Final Answer: \[ \boxed{-3} \] Next Question / Full Exercise

Simplify exponential expression Simplify: \[ \left[\frac{5^{-1}\cdot7^2}{5^2\cdot7^{-4}}\right]^{7/2} \times \left[\frac{5^{-2}\cdot7^3}{5^3\cdot7^{-5}}\right]^{-5/2} \] Solution \[ \left[\frac{5^{-1}}{5^2}\cdot\frac{7^2}{7^{-4}}\right]^{7/2} = \left[5^{-3}\cdot7^{6}\right]^{7/2} \] \[ = 5^{-21/2}\cdot7^{21} \] \[ \left[\frac{5^{-2}}{5^3}\cdot\frac{7^3}{7^{-5}}\right]^{-5/2} = \left[5^{-5}\cdot7^{8}\right]^{-5/2} \] \[ = 5^{25/2}\cdot7^{-20} \] \[ \text{Multiplying: } = 5^{-21/2+25/2}\cdot7^{21-20} \] \[ = 5^{2}\cdot7 \] \[ = 25\cdot7 = 175 \] Final Answer: \[ \boxed{175} \] Next Question / Full Exercise

Simplify (√2/5)^2 / (√2/5)^13 Simplify: \(\frac{(\sqrt{2}/5)^2}{(\sqrt{2}/5)^{13}}\) Solution \[ = \left(\frac{\sqrt{2}}{5}\right)^{2-13} \] \[ = \left(\frac{\sqrt{2}}{5}\right)^{-11} \] \[ = \left(\frac{5}{\sqrt{2}}\right)^{11} \] Final Answer: \[ \boxed{\left(\frac{5}{\sqrt{2}}\right)^{11}} \] Next Question / Full Exercise

Simplify 5(8^(1/3) + 27^(1/3))^3 Simplify: \(5(8^{1/3} + 27^{1/3})^3\) Solution \[ 8^{1/3} = 2,\quad 27^{1/3} = 3 \] \[ = 5(2 + 3)^3 \] \[ = 5 \cdot 5^3 \] \[ = 5 \cdot 125 \] \[ = 625 \] Final Answer: \[ \boxed{625} \] Next Question / Full Exercise

Simplify (0.001)^(1/3) Simplify: \((0.001)^{1/3}\) Solution \[ 0.001 = 10^{-3} \] \[ = (10^{-3})^{1/3} \] \[ = 10^{-1} \] \[ = 0.1 \] Final Answer: \[ \boxed{0.1} \] Next Question / Full Exercise