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Expand if necessary combine like terms (7+x)(7-x)=
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Expand if necessary combine like terms (7+x)(7-x)=

User Redbandit
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1 Answer

1 vote

Answer:

49 - x^2

Explanation:

(7+x)(7-x)

We know this is the difference of squares

(a-b) (a+b) = a^2 - b^2

7^2 - x^2 = 49-x^2

We can also FOIL

first = 7*7 = 49

Outer: = 7x

Inner: = -7x

Last : -x*x = -x^2

Add them together

49 +7x-7x - x^2

Combine like terms

49-x^2

User Rick Glos
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