SOLUTION: (x-4)(x-5) please solve using multiplication

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Question 381567: (x-4)(x-5) please solve using multiplication
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
%28x-4%29%28x-5%29 Start with the given expression.


Now let's FOIL the expression.


Remember, when you FOIL an expression, you follow this procedure:


%28highlight%28x%29-4%29%28highlight%28x%29-5%29 Multiply the First terms:%28x%29%2A%28x%29=x%5E2.


%28highlight%28x%29-4%29%28x%2Bhighlight%28-5%29%29 Multiply the Outer terms:%28x%29%2A%28-5%29=-5%2Ax.


%28x%2Bhighlight%28-4%29%29%28highlight%28x%29-5%29 Multiply the Inner terms:%28-4%29%2A%28x%29=-4%2Ax.


%28x%2Bhighlight%28-4%29%29%28x%2Bhighlight%28-5%29%29 Multiply the Last terms:%28-4%29%2A%28-5%29=20.


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So we have the terms: x%5E2, -5%2Ax, -4%2Ax, 20


x%5E2-5%2Ax-4%2Ax%2B20 Now add every term listed above to make a single expression.


x%5E2-9%2Ax%2B20 Now combine like terms.


So %28x-4%29%28x-5%29 FOILs to x%5E2-9%2Ax%2B20.


In other words, %28x-4%29%28x-5%29=x%5E2-9%2Ax%2B20.


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

Also, feel free to check out my tutoring website

Jim