You can solve this using Newton's Method. First, solve the equation for zero, and use it to define the function f(x):
Let f(x) = x3 - x - 20
It's derivative then would be:
f'(x) = 3x2 - 1
Now let's take a rough guess at what x would be - we'll go with three - and plug it into the system xn+1 = xn - f(xn) / f'(xn):
x0 = 3
x1 = x0 - (x03 - x0 - 20) / (3 * x02 - 1) = 2.8461538461538461539
x2 = x1 - (x13 - x1 - 20) / (3 * x12 - 1) = 2.8371684181740047662
x3 = x2 - (x23 - x2 - 20) / (3 * x22 - 1) = 2.8371386689493412305
x4 = x3 - (x33 - x3 - 20) / (3 * x32 - 1) = 2.8371386686239233464
x5 = x4 - (x43 - x4 - 20) / (3 * x42 - 1) = 2.8371386686239233464
So x is approximately equal to 2.8371386686239233464. If we plug that into the original equation, we can see that it is correct:
2.83713866862392334643 = 22.8371386686239233464
22.8371386686239233464 - 2.8371386686239233464 = 20
Chat with our AI personalities
You would have to take the cube root of 400000, which equals 73.68
To solve for x, we'd have to know what this expression equals.
4368/24 = 182 24 x 14 x 13 = 4368
You have to put your heart into it!
40
x=1
You would have to take the cube root of 400000, which equals 73.68
x = 5
20 cubed cubed = [203]3 = (20 x 20 x 20)3 This equals 20 x 20 x 20 x 20 x 20 x 20 x 20 x 20 x 20 which = (20)9 The rule to work it out is:multiply the two exponents ie 3 x 3 = 9 206 is 20 x 20 x 20 x 20 x 20 x 20 which is obviously less than 209. See: http://oakroadsystems.com/math/expolaws.htm#WhatsNew#WhatsNew
(20 - x)/5
To solve for x, we'd have to know what this expression equals.
4368/24 = 182 24 x 14 x 13 = 4368
25
x times x times x equals x cubed
x = 20
You have to put your heart into it!
40