SOLUTION: I sent this in earlier, I've now included my work. Need help. Thanks (3+sqrt-5)(7-sqrt-10) (3+sqrt-5)^2(7-sqrt-10)^2=0 (9+5i)(49-10i)=0 441-90i+245i-50i^2=0 441+155i-50(-1)

Question 192031This question is from textbook Colleg Algebra A Graphing Approach
: I sent this in earlier, I've now included my work.
Need help. Thanks
(3+sqrt-5)(7-sqrt-10)
(3+sqrt-5)^2(7-sqrt-10)^2=0
(9+5i)(49-10i)=0
441-90i+245i-50i^2=0
441+155i-50(-1)=0
441+155i+50=0
answer 491+155i
a+bi form This question is from textbook Colleg Algebra A Graphing Approach

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.

Rearrange the terms

Group the terms and factor out the term "i"

So FOILs to .

In other words, .

The number is now in standard form where and

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