SOLUTION: x SQUARED(2) + 7 = 21 CAN YOU HELP ME SOLVE THIS EQUATION? ALSO COULD YOU EXPLAIN HOW YOU WOULD KNOW IF YOU SUBTRACT, DIVIDE OR ADD TO THE OTHER SIDE?

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Question 38398: x SQUARED(2) + 7 = 21 CAN YOU HELP ME SOLVE THIS EQUATION? ALSO COULD YOU EXPLAIN HOW YOU WOULD KNOW IF YOU SUBTRACT, DIVIDE OR ADD TO THE OTHER SIDE?
Found 2 solutions by fractalier, Nate:
Answer by fractalier(6550) (Show Source):
You can put this solution on YOUR website!
The general idea is to isolate x on one side of the equation and put everything else on the other side...to do that, you normally try to UNDO what is being done to x...so in this problem
x^2 + 7 = 21
you want to undo the +7 by subtracting 7 from both sides first, giving us
x^2 = 14
now you want to take the square root of both sides. This undoes the squaring of x, and we get
x = � sqrt(14)
Two answers, a plus and a minus square root of 14.

Answer by Nate(3500) (Show Source):
You can put this solution on YOUR website!
subtract seven to each side in order to get 'x' on one side
divide by 2 to get 'x' on one side
square root each side in order to get 'x' equaling a number
or