Answer:
Explanation:
We are given the equation:
Make ‘x’ the subject of the formula by square root both sides:
Cancel the square root and square in RHS and write plus-minus in LHS:
Therefore, the solution is
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Summary
To make a variable as the subject of equation means to isolate that variable. For an example, if you want to make y as the subject, you’ll have to isolate y-term.
You may also be curious why do you have to add plus-minus on another side when cancelling
because
and
for their positive and their counterparts (opposite/negative) will always give same y-value.
From an example:
can be rewritten as
, cancel absolute sign/square root then write plus-minus which the solution is
and if you substitute x = 4 or -4, the equation will be true for both values.
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Others
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