SOLVING EQUATIONS WITH RATIONAL EXPONENTS

To solve equations with rational exponents, we will follow the steps given below.

Step 1 :

Using inverse operations isolate the variable in one side and numerical value to the other side.

Step 2 :

When we move the exponent to the other side, it can be turned into its reciprocal.

solvingrationalexponent

Solve.

Problem 1 :

x12 = 7

Solution:

x12 = 7

Raise power 2 on both sides,

x12 = 7x122 =72x = 49

Problem 2 :

x23 = 64

Solution:

x23 = 64

Raise power 3 on both sides,

x233 = 643x2 = 643x = 643x = 64 × 64 × 64x = 6464x = 64 × 8x = 512

Problem 3 :

x-14 = 5

Solution :

Moving the power to the other side, we get

x-14 = 5x= 5x= 5

To get rid of the negative exponent, we take reciprocals on both sides.

x = 154x = 1625

Problem 4 :

x-35 = -27

Solution :

x-35 = -27x-35 = (-3)3x = (-3)3 × -53x = (-3)-5x = -1243

Problem 5 :

x35-6 = -5

Solution :

Moving the power to the other side.

x35-6 = -5x35= -5+6x35= 1x = 153x = 1

Problem 6 :

x47=

Solution :

Writing 16 in exponential form, we get

x47=x47=x=x=x=

Problem 7 :

x23+ 13=

Solution :

x23+13=9x23=9 - 13x23=-4x = -432

Since we have negative inside the square root, it has no solution.

Problem 8 :

x-52-57=186

Solution :

x-52-57=186x-52=186 + 57x-52=243x-52=35x=3-25 x=3-2x = 19

Problem 9 :

x43=

Solution :

x43=x43=x43=x=x=x=

Problem 10 :

x37=

Solution :

x37=x37=x37=x=x=

Problem 11 :

35x-23=320

Solution :

35x-23=320x-23=320×53x-23=14x=14-32x=12-32x=12-3x=23x= 8

Problem 12 :

8x23=16

Solution :

8x23=16x23=2x=232x=2232x=23x=22

Problem 13 :

x53+ 75=

Solution :

x53+ 75=x53=x53=x53=x53=x=x=(-2)3x = -8

Problem 14 :

15x34- 31=-6

Solution :

15x34- 31=-615x34=-6+3115x34=25x34=25(5)x34=125x34=53x=543x=54x = 625

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