How do you multiply these: (9 + √10)(9  √10) Use the foil method when multiplying two binomials. (9 + √10)(9  √10) = 9(9) + 9(√10) + √10(9) + √10(√10) {used foil method} = 81  9√10 + 9√10  √100 {multiplied through} = 81  √100 {combined like terms} = 81  10 {evaluated square root of 100 to be 10} = 71  Algebra House
2 Comments
Muhsin
1/31/2011 12:11:54 am
Can we use diffenrence of 2 squares ?
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Algebra House
1/31/2011 03:10:37 am
Yes, as with many problems, there are other ways to work this.
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