You are watching: How to do fourth root on ti-84
Before you begin calculating cube roots, it"s advantageous to remind what happens when a number is cubed. If girlfriend cube any number, friend multiply the number by itself three times. So come cube 4 (also composed as 43), you"d main point 4 × 4 × 4, which equals 64. Come cube 5 (also written as 53), you"d main point 5 × 5 × 5, which equals 125 and so on.
A cube root is simply the turning back operation, functioning backward from a number to discover which various other number, multiply by itself three times, gets you that original number. Therefore the cube root of 125 is 5, since 53 = 125. Calculating cube root by hand deserve to be tiresome at finest if friend don"t have them memorized, but calculating them through your calculator needs nothing more than a few keystrokes.
Enter the expression – that is, the number – you"re analyzing the cube source of. Climate press enter to obtain your answer. If you gone into 343 her calculator would certainly return 7 together the answer because 73 = 343.
You deserve to use a similar technique to calculate various other roots top top the TI-84, TI-84 plus or TI-84 Plus silver Edition. You simply need to pick a different duty from the math menu.
Press the math key, complied with by the 5 key. This opens an undefined root template, which deserve to be offered for any index. The table of contents is the small number that appears above and come the left the a root symbol for anything yet a square root. It tells you how plenty of times the secret number had to be multiplied with each other to produce the number under the root/radical sign.
Enter the table of contents of the root you want. You might enter 3 because that a cube root, 4 because that a 4th root and so on. Then push the right arrow key and get in the expression you want to evaluate. This is the number that goes under the radical sign. Press enter to gain your result.
So, for example, if you entered 4 as the index to uncover the fourth root, climate 81 as the expression to be evaluated, you"d end up with response of 3, because 34 = 81.
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Lisa studied mathematics at the college of Alaska, Anchorage, and spent number of years tutoring high school and also university students through scary -- yet fun! -- math subjects choose algebra and calculus.