Question

How do I solve 81-4x^2=0

Answer 1

steps:
1) add 4x^2 to both side
2) divide both sides by 4
3) take square root both sides
you will get a value for x that is the solution

Answer 2

Okay thank you :D, but is it just the one value for x?

Answer 3

Also this is a non calculator question so how do I square root 20.25?

Answer 4

in this case x could have two possible values, one positive and one negative.

Answer 5

write 20.25 like 2025/100

Answer 6

then find the square root of 2025/100

Answer 7

81-4x^2=0
Bring 81 on the right side

4x^2=81

Divide 81 with 4

x^2=81/4

Answer 8

x=(+/-) sqrt(81/4)
x=(+/-) 9/2

Answer 9

Okay thank you so much :D

Answer 10

Yw,cheese ball.