Homework Help: Math

Posted by MJ on Sunday, March 7, 2010 at 2:35pm.

How do i solve the following by factorization:
1) 7.7^2-2.3^2
2) 43*56+43*44

I know how to do these manually but not by factorization.

Math - Reiny, Sunday, March 7, 2010 at 2:44pm
these questions have been 'fudged' so that they can be done mentally by using basic factoring techniques.

for the first
7.7^2-2.3^2 , I see the difference of squares
= (7.7 + 2.3)(7.7-2.3)
= 10 (5.4)
= 54

the last one uses 'common factoring'
43*56 + 43*44
= 43(56+44)
= 43*100
= 4300
Math - MJ, Sunday, March 7, 2010 at 2:55pm
thanks for helping.

Answer this Question

Related Questions

statistics - Construct a frequency distribution table to organize the following ...
Algebra - (x+4)-5=43 how would you solve that. because i tried it and i got 28 ...
Algebra - When I asked you about the following problem:Solve 4sqrt(6x-2)>...
Math estimate with benchmark - Could you please check ifI have these right? i ...
chemistry - A volatile liquid was allowed to evorate in a 43.298g flask that has...
Trigonometry - Please review and tell me if i did something wrong. Find the ...
Chemistry - A 6.00 M H2SO4 solution has d = 1.34 g/mL. What is the mass percent ...
Algebra - Could you please check my answers and help with the ones I can't ...
statistics - The revenue Commissioners Ireland conducted a contest for promotion...
Stats (Finance) - Given the following information: Year X Y Z 2004 12.53 2.64 -4...

For Further Reading

First Name:
School Subject:
Answer: