Asked by Joy
2+square root of 4-x=x
rewrite it as
√(4-x) = x-2
now square both sides
4-x = x^2 - 4x + 4
x(x-3)=0
so x = 0 or x = 3
<b>BUT</b> when we square an equation, all answers must be verified in the original equation
Which answer works and which doesn't?
rewrite it as
√(4-x) = x-2
now square both sides
4-x = x^2 - 4x + 4
x(x-3)=0
so x = 0 or x = 3
<b>BUT</b> when we square an equation, all answers must be verified in the original equation
Which answer works and which doesn't?
Answers
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