SOLUTION: Hi, I need help with solving these using the square root property: Solve using the square root property: 5x2 = 100 Solve using the square root property: (x + 8)

Algebra ->  Square-cubic-other-roots -> SOLUTION: Hi, I need help with solving these using the square root property: Solve using the square root property: 5x2 = 100 Solve using the square root property: (x + 8)      Log On


   

Question 196769: Hi, I need help with solving these using the square root property:
Solve using the square root property:
5x2 = 100

Solve using the square root property:
(x + 8)2 = 81
Answer by RAY100(1637) About Me  (Show Source):
You can put this solution on YOUR website!
5x^2 =100
divide by 5
x^2 =20
sqrt
x= +/- sqrt20 = +/- sqrt (4*5) = +/- 2sqrt5
.
checks ok
.
.
(x+8)^2 =81
sqrt
(x+8) = +/- 9
(x+8) =9,,,,,,,,,(x+8)=-9
x=1,,,,,,,,,,,,,,,,,,x=-17
.
checks ok