Withdrawing $10 every week from an outstanding balance of $400
2 answers:
Answer:
.
Step-by-step explanation:
Let w represent the number of weeks.
We are supposed to write an expression for the given word phrase.
Since the with-drawl amount is $10 per week, so amount withdrawn in w weeks would be .
The amount left after w weeks would be $400 minus .
Therefore, our required expression would be .
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ANSWER
EXPLANATION
We use the method of completing the squares.
The equation is
We rewrite the above equation to obtain;
We divide through by 3 to obtain;
We add half the coefficient of
to both sides of the equation to get,
The right hand side is now a perfect square.
We now take square root of both sides to get;
We add -2 to both sides,
We simplify to obtain,
EXPLANATION
We use the method of completing the squares.
The equation is
We rewrite the above equation to obtain;
We divide through by 3 to obtain;
We add half the coefficient of
to both sides of the equation to get,
The right hand side is now a perfect square.
We now take square root of both sides to get;
We add -2 to both sides,
We simplify to obtain,