Solution - Linear equations with one unknown
Other Ways to Solve
Linear equations with one unknownStep by Step Solution
Rearrange:
Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :
c^2*c-6-(180)=0
Step by step solution :
Step 1 :
Trying to factor as a Difference of Cubes:
1.1 Factoring: c3-186
Theory : A difference of two perfect cubes, a3 - b3 can be factored into
(a-b) • (a2 +ab +b2)
Proof : (a-b)•(a2+ab+b2) =
a3+a2b+ab2-ba2-b2a-b3 =
a3+(a2b-ba2)+(ab2-b2a)-b3 =
a3+0+0-b3 =
a3-b3
Check : 186 is not a cube !!
Ruling : Binomial can not be factored as the difference of two perfect cubes
Polynomial Roots Calculator :
1.2 Find roots (zeroes) of : F(c) = c3-186
Polynomial Roots Calculator is a set of methods aimed at finding values of c for which F(c)=0
Rational Roots Test is one of the above mentioned tools. It would only find Rational Roots that is numbers c which can be expressed as the quotient of two integers
The Rational Root Theorem states that if a polynomial zeroes for a rational number P/Q then P is a factor of the Trailing Constant and Q is a factor of the Leading Coefficient
In this case, the Leading Coefficient is 1 and the Trailing Constant is -186.
The factor(s) are:
of the Leading Coefficient : 1
of the Trailing Constant : 1 ,2 ,3 ,6 ,31 ,62 ,93 ,186
Let us test ....
| P | Q | P/Q | F(P/Q) | Divisor | |||||
|---|---|---|---|---|---|---|---|---|---|
| -1 | 1 | -1.00 | -187.00 | ||||||
| -2 | 1 | -2.00 | -194.00 | ||||||
| -3 | 1 | -3.00 | -213.00 | ||||||
| -6 | 1 | -6.00 | -402.00 | ||||||
| -31 | 1 | -31.00 | -29977.00 | ||||||
| -62 | 1 | -62.00 | -238514.00 | ||||||
| -93 | 1 | -93.00 | -804543.00 | ||||||
| -186 | 1 | -186.00 | -6435042.00 | ||||||
| 1 | 1 | 1.00 | -185.00 | ||||||
| 2 | 1 | 2.00 | -178.00 | ||||||
| 3 | 1 | 3.00 | -159.00 | ||||||
| 6 | 1 | 6.00 | 30.00 | ||||||
| 31 | 1 | 31.00 | 29605.00 | ||||||
| 62 | 1 | 62.00 | 238142.00 | ||||||
| 93 | 1 | 93.00 | 804171.00 | ||||||
| 186 | 1 | 186.00 | 6434670.00 |
Polynomial Roots Calculator found no rational roots
Equation at the end of step 1 :
c3 - 186 = 0
Step 2 :
Solving a Single Variable Equation :
2.1 Solve : c3-186 = 0
Add 186 to both sides of the equation :
c3 = 186
When two things are equal, their cube roots are equal. Taking the cube root of the two sides of the equation we get:
c = ∛ 186
The equation has one real solution
This solution is c = ∛186 = 5.7083
One solution was found :
c = ∛186 = 5.7083How did we do?
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