Step by Step Solution
Rearrange:
Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :
x^210*13-(4)=0
Step by step solution :
Step 1 :
Equation at the end of step 1 :
13x210 - 4 = 0
Step 2 :
Trying to factor as a Difference of Squares :
2.1 Factoring: 13x210-4
Theory : A difference of two perfect squares, A2 - B2 can be factored into (A+B) • (A-B)
Proof : (A+B) • (A-B) =
A2 - AB + BA - B2 =
A2 - AB + AB - B2 =
A2 - B2
Note : AB = BA is the commutative property of multiplication.
Note : - AB + AB equals zero and is therefore eliminated from the expression.
Check : 13 is not a square !!
Ruling : Binomial can not be factored as the
difference of two perfect squares
Trying to factor as a Difference of Cubes:
2.2 Factoring: 13x210-4
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 : 13 is not a cube !!
Ruling : Binomial can not be factored as the difference of two perfect cubes
Equation at the end of step 2 :
13x210 - 4 = 0
Step 3 :
Solving a Single Variable Equation :
3.1 Solve : 13x210-4 = 0
Add 4 to both sides of the equation :
13x210 = 4
Divide both sides of the equation by 13:
x210 = 4/13 = 0.308
x = 210th root of (4/13)
The equation has two real solutions
These solutions are x = 210th root of ( 0.308) = ± 0.99440
Two solutions were found :
x = 210th root of ( 0.308) = ± 0.99440How did we do?
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