Solve the equation below. Show your work and explain your steps.
Use ^ to indicate a power and "sqrt" to indicate a radical.
can some one plz solve this 2x^2 = 16?
2008-06-20 6:50 pm
回答 (10)
2008-06-20 6:54 pm
✔ 最佳答案
2x^2 - 16 = 02(x^2 - 8) = 0
so solution is when x^2 = 8
so x = sqrt(8) = +/- 2sqrt(2)
參考: Note that sqrt gives both a positive and negative solution (although a calculator won't tell you this). This is because (-2)(-2) = 4 and (2)(2) = 4 also.
lol I made a mistake and corrected but people are so quick on here I got thumbed down before I could fix it. Even though it took me 10 seconds to fix it. Damn you people are quick to judge, lol :)
2008-06-21 1:53 am
2x² = 16
x² = 8
x = ±2â2
You should be getting the point by now. If your not, I really feel sorry for you.
x² = 8
x = ±2â2
You should be getting the point by now. If your not, I really feel sorry for you.
2008-06-21 1:56 am
2x^2 =16.
x^2 = 16/2 =8.
x= square root of 8.
x^2 = 16/2 =8.
x= square root of 8.
2008-06-21 1:53 am
2x² = 16
Divide by 2:
x² = 8
Square root of both sides:
x = 屉8
simplify the radical:
x = 屉(4 * 2)
x = ±2â2
Divide by 2:
x² = 8
Square root of both sides:
x = 屉8
simplify the radical:
x = 屉(4 * 2)
x = ±2â2
2008-06-22 2:09 am
x² = 8
x² = (4) (2)
x = ± 2 â2
x² = (4) (2)
x = ± 2 â2
2008-06-21 1:58 am
Divide both sides by 2
2x^2/2 = x^2 = 16/2 = 8
sqrt(8) = sqrt(4*2) = sqrt(4)*sqrt(2) = 2*sqrt(2)
Taking the square root of both sides
x = 2*sqrt(2) and x = -2*sqrt(2)
2x^2/2 = x^2 = 16/2 = 8
sqrt(8) = sqrt(4*2) = sqrt(4)*sqrt(2) = 2*sqrt(2)
Taking the square root of both sides
x = 2*sqrt(2) and x = -2*sqrt(2)
參考: Longtime college math teacher
2008-06-21 1:57 am
2x^2 = 16
x^2 = 16/2
x^2 = 8
x = 屉8
x = ±2.82 (approx.)
x^2 = 16/2
x^2 = 8
x = 屉8
x = ±2.82 (approx.)
參考: Square Root Calculator
http://www.math.com/students/calculators/source/square-root.htm
2008-06-21 1:55 am
x^2=8 x=+-sqrt(8)=+-2sqrt(2)
2008-06-21 1:58 am
(2x)^2=16
now here,(2x)^2=4x^2(the power is only for x)
4x^2=16
x^2=4
this tells,x=sqrt(4)
=2
2 is the answer
now here,(2x)^2=4x^2(the power is only for x)
4x^2=16
x^2=4
this tells,x=sqrt(4)
=2
2 is the answer
收錄日期: 2021-05-01 10:46:16
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