SOLUTION: Find the product of (3x + 7y)(3x − 7y). A: 9x^2 − 42xy + 49y^2 B: 9x^2 + 42xy + 49y^2 C: 9x^2 − 49y^2 D: 9x^2 + 49y^2 the answer is c right?

Question 338081: Find the product of (3x + 7y)(3x − 7y).
A: 9x^2 − 42xy + 49y^2
B: 9x^2 + 42xy + 49y^2
C: 9x^2 − 49y^2
D: 9x^2 + 49y^2
the answer is c right?
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the given expression.

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, .

So you are correct. The answer is C). Good job.

If you need more help, email me at jim_thompson5910@hotmail.com

Also, feel free to check out my tutoring website.

Jim
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SOLUTION: Find the product of (3x + 7y)(3x &#8722; 7y). A: 9x^2 &#8722; 42xy + 49y^2 B: 9x^2 + 42xy + 49y^2 C: 9x^2 &#8722; 49y^2 D: 9x^2 + 49y^2 the answer is c right?

SOLUTION: Find the product of (3x + 7y)(3x − 7y). A: 9x^2 − 42xy + 49y^2 B: 9x^2 + 42xy + 49y^2 C: 9x^2 − 49y^2 D: 9x^2 + 49y^2 the answer is c right?