Compare the following numbers and find the greatest among them: āϤāϞāϤ āĻĻāĻŋāϝāĻŧāĻž āϏāĻāĻā§āϝāĻžāĻŦā§ā§° āϤā§āϞāύāĻž āĻā§°āĻ āĻā§°ā§ āĻāĻāĻžāĻāϤāĻā§ āĻĄāĻžāĻā§° āϏāĻāĻā§āϝāĻžāĻā§ āύāĻŋā§°ā§āĻŖāϝāĻŧ āĻā§°āĻāĻ 2^120, 3^75, 5^60, 7^45
Q: Compare the following numbers and find the greatest among them: 2120, 375, 560, 745
Easy Trick: Convert to “same exponent form”
We try to write each number as (something)common exponent
1st: Factor the exponents if possible
- 2¹²â° → 2¹²â° = (2â¸)¹âĩ = 256¹âĩ
- 3âˇâĩ → 3âˇâĩ = (3âĩ)¹âĩ = 243¹âĩ
- 5âļâ° → 5âļâ° = (5â´)¹âĩ = 625¹âĩ
- 7â´âĩ → 7â´âĩ = (7³)¹âĩ = 343¹âĩ
Now all numbers are of the form: (base)15
2nd: Compare the bases : 256, 243, 625, 343 → Clearly 625 is the largest.
3rd: Conclude : 560 = 62515 is the largest number.
Why this trick works:
- If powers are all equal, the largest base gives the largest number.
- So just factor the exponents to make them the same, then compare bases.
Ans: 560
āĻĒā§ā§°āĻļā§āύ: āϤāϞāϤ āĻĻāĻŋāϝāĻŧāĻž āϏāĻāĻā§āϝāĻžāĻŦā§ā§° āϤā§āϞāύāĻž āĻā§°āĻ āĻā§°ā§ āĻāĻāĻžāĻāϤāĻā§ āĻĄāĻžāĻā§° āϏāĻāĻā§āϝāĻžāĻā§ āύāĻŋā§°ā§āĻŖāϝāĻŧ āĻā§°āĻāĻ
2120, 375, 560, 745
Easy Trick: Convert to the Same Exponent Form (āϏāĻšāĻ āĻā§ā§°āĻŋāĻ: āϏāĻāϞ⧠āϏāĻāĻā§āϝāĻžāĻ āĻāĻā§ āĻāĻžāϤāϤ āϞāĻŋāĻāĻž)
1st: Factor the exponents if possible (āĻĒā§ā§°āĻĨāĻŽā§ āĻāĻžāϤāĻŦā§ā§° āĻāĻžāĻāĻŋ āĻāĻā§ āĻāĻžāϤ āĻŦāύāĻžāĻāĻ)
· = (28)15 = 25615
· 375 = (35)15 = 24315
· 560 = (54)15 = 62515
· 745 = (73)15 = 34315
Now all numbers are of the form (base)15
(āĻāϤāĻŋāϝāĻŧāĻž āϏāĻāϞ⧠āϏāĻāĻā§āϝāĻž āĻāĻā§āĻ āĻāĻžāϤ (15) āϤ āĻāĻā§)
Compare the bases (āĻāϤāĻŋāϝāĻŧāĻž āĻā§ā§ąāϞ āĻāĻŋāϤā§āϤāĻŋ āϤā§āϞāύāĻž āĻā§°ā§āĻ)
Bases: 256, 243, 625, 343
Clearly, 625 is the largest base (āϏā§āĻĒāώā§āĻāĻāĻžā§ąā§ 625 āĻāĻāĻžāĻāϤāĻā§ āĻĄāĻžāĻā§°)
Conclusion (āĻāĻĒāϏāĻāĻšāĻžā§°)
560 = 62515 is the largest number.
āĻā§ā§°āĻŋāĻ:
If powers are equal, the number with the largest base is the greatest. So we make all exponents the same and then compare only the bases.āϝā§āϤāĻŋāϝāĻŧāĻž āϏāĻāϞ⧠āϏāĻāĻā§āϝāĻžā§° āĻāĻžāϤ āĻāĻā§ āĻšāϝāĻŧ, āϤā§āϤāĻŋāϝāĻŧāĻž āϝāĻžā§° āĻāĻŋāϤā§āϤāĻŋ āĻĄāĻžāĻā§°, āϏā§āĻ āϏāĻāĻā§āϝāĻžāĻ āϏ⧰ā§āĻŦāĻžāϧāĻŋāĻ āĻšāϝāĻŧāĨ¤ āϏā§āϝāĻŧā§ āĻāĻžāϤāĻŦā§ā§° āĻāĻā§ āĻā§°āĻŋ āĻā§ā§ąāϞ āĻāĻŋāϤā§āϤāĻŋ āϤā§āϞāύāĻž āĻā§°āĻŋāϞā§āĻ āĻšāϝāĻŧāĨ¤
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