A stack of boards is 21 inches high. Each board is 1 and 3/4 inches thick. How many boards are there?
1 answer:
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Answer:
Step-by-step explanation:
is essentially
(you are squaring
, so multiplying it by itself), so to simplify, you would need to distribute.
A good way to go about this is using the F.O.I.L. method, multiplying the First numbers in the parentheses, then the Outers, then Inners, and finally, Lasts.
>>
>>
>>
()
After doing so, you would end up with , and after combining like terms,
.
To write the expression in standard form, though, just order the terms from highest to lowest power!