Question

What is the answer for 4y^2=81

Answer 1

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.

Answer 2

Answer:
either y = 4.5
or y = -4.5

Explanation:
To get the solution, we will need to isolate the y on one side of the equation.
This can be done as follows:
4y² = 81

$\frac{4y^2}{4} = \frac{81}{4}$

y² = 20.25

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

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

Hope this helps :)