Math

Question Solve for yy in the equation 5y23+7=275 y^{\frac{2}{3}} + 7 = 27.

Studdy Solution

STEP 1

Assumptions
1. We are given the equation 5y23+7=275 y^{\frac{2}{3}} + 7 = 27.
2. We need to solve for the variable yy.

STEP 2

First, we need to isolate the term containing the variable yy on one side of the equation. We can do this by subtracting 77 from both sides of the equation.
5y23+77=2775 y^{\frac{2}{3}} + 7 - 7 = 27 - 7

STEP 3

Simplify both sides of the equation.
5y23=205 y^{\frac{2}{3}} = 20

STEP 4

Next, we need to isolate y23y^{\frac{2}{3}}. We can do this by dividing both sides of the equation by 55.
5y235=205\frac{5 y^{\frac{2}{3}}}{5} = \frac{20}{5}

STEP 5

Simplify both sides of the equation.
y23=4y^{\frac{2}{3}} = 4

STEP 6

To solve for yy, we need to get rid of the fractional exponent. We can do this by raising both sides of the equation to the reciprocal power of 23\frac{2}{3}, which is 32\frac{3}{2}.
(y23)32=432\left(y^{\frac{2}{3}}\right)^{\frac{3}{2}} = 4^{\frac{3}{2}}

STEP 7

When we raise a power to a power, we multiply the exponents. The left side simplifies because 23×32=1\frac{2}{3} \times \frac{3}{2} = 1, which leaves us with yy to the power of 11, or simply yy.
y=432y = 4^{\frac{3}{2}}

STEP 8

To calculate 4324^{\frac{3}{2}}, we can first take the square root of 44 and then raise the result to the power of 33.
412=4=24^{\frac{1}{2}} = \sqrt{4} = 2

STEP 9

Now, raise 22 to the power of 33.
23=2×2×2=82^3 = 2 \times 2 \times 2 = 8

STEP 10

Thus, we find the value of yy.
y=8y = 8
The solution to the equation 5y23+7=275 y^{\frac{2}{3}} + 7 = 27 is y=8y = 8.

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