What is the answer for 4y^2=81

Mathematics

2 answers:

rodikova [14]3 years ago

7 0

Answer:

y = ± 4.5.

Step-by-step explanation:

Given : 4y²=81

To find : Solve for y

Solution : We have given that

4y²=81

On dividing by 4 both sides

y²= $\frac{81}{4}$

y²= 20.25

On taking square root both sides

y = $\sqrt{20.25}$

y = ± 4.5

Therefore, y = ± 4.5.

Elena L [17]3 years ago

3 0

<span><u><em>Answer:</em></u>
either y = 4.5
or y = -4.5

<u><em>Explanation:</em></u>
To get the solution, we will need to isolate the y on one side of the equation.
<u>This can be done as follows:</u>
4y</span>²<span> = 81

</span> $\frac{4y^2}{4} = \frac{81}{4}$
<span>
y</span>²<span> = 20.25

y = +/- </span>√(20.25)<span>
either y = +</span>√<span>(20.25) = 4.5
or y = -</span>√<span>(20.25) = -4.5

Since there are no restrictions on the value of y, therefore, both answers would be accepted

Hope this helps :)</span>

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