SOLUTION: I need to expand this quadratic equation:
(3r+8)^2
I answered 3r^2-+2(8*3)+64 ,but it was counted wrong.
Could anyone help me?
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Question 550665: I need to expand this quadratic equation:
(3r+8)^2
I answered 3r^2-+2(8*3)+64 ,but it was counted wrong.
Could anyone help me?
Found 2 solutions by jim_thompson5910, josmiceli:
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the given expression.
Expand. Remember something like .
Now let's FOIL the expression.
Remember, when you FOIL an expression, you follow this procedure:
Multiply the First terms:.
Multiply the Outer terms:.
Multiply the Inner terms:.
Multiply the Last terms:.
---------------------------------------------------
So we have the terms: , , ,
Now add every term listed above to make a single expression.
Now combine like terms.
So FOILs to .
In other words, .
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
answer
----------------------
There's a very simple way to check this
Pick a small prime number like 13
and say
and
OK
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