A recipe uses 21/4 cups flour for a batch of cookies.Henry makes 10 batches of cookies for the bake sale. How many cups of flour
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or
We have
Since we cannot factor easily, we complete the square.
Adding 2 to both sides give,
Dividing through by 3 gives
Adding
to both sides gives
The expression on the Left Hand side is a perfect square.
Splitting the plus or minus sign gives
or
or
We have
Since we cannot factor easily, we complete the square.
Adding 2 to both sides give,
Dividing through by 3 gives
Adding
The expression on the Left Hand side is a perfect square.
Splitting the plus or minus sign gives
or
