Sagot :
the answer is x=20
x² = 400 .. u square root both sides , making the exponent on the x be cancelled
.. then the square root of 400 is 20 so
x=20
x² = 400 .. u square root both sides , making the exponent on the x be cancelled
.. then the square root of 400 is 20 so
x=20
Answer:
= − 20
Step-by-step explanation:
Move terms to the left side
2=400
x^{2}=400x2=400
2−400=0
Use the quadratic formula
[tex] \times = \frac{ - \: b \:
+ \sqrt{ {b}^{2} - 4ac } }{2a} [/tex]
- Once in standard form, identify a, b and c from the original equation and plug them into the quadratic formula.
^2 − 400 = 0
a = 0
b = 1
c = - 400
[tex] \times = \frac{ - 0 + \sqrt{ {0}^{2} - 4.1( - 400)} }{2.1} [/tex]
- Evaluate the exponent
- Multiply the numbers
- Add the numbers
- Evaluate the square root
- Multiply the numbers
[tex] \times = \frac{0 + 40}{2} [/tex]
[tex] \times = \frac{0 - 40}{2} [/tex]
Rearrange and isolate the variable to find each solution
= 20
= − 20