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(ab - 9)(ab + 8)

how do you foil this?

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Nancy N. | Outstanding Elementary and Spanish Teacher working with grades K-12Outstanding Elementary and Spanish Teach...
4.9 4.9 (35 lesson ratings) (35)
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ab and ab are put together creating "a" squared and "b "squared Then you multiply (8*ab) and (-9*ab) which gives you +8ab and -9ab -9*8 which gives you a squared*b squared - 1 ab-72 or a squared b squared - 1ab-72. Sorry, but I have no idea how to do square numbers on the computer.
Nancy n.
Andres F. | Great Mathematician, Math Genius, Great teacher & tutorGreat Mathematician, Math Genius, Great ...
4.8 4.8 (88 lesson ratings) (88)
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Step 1: (ab-9)(ab+8)

Step 2: ab x ab +8 x ab -9 x ab -9 x 8

Step 3:  ab +8ab-9ab-72=

Step 4: ab2 -ab-72

solved!!! that how you would solve it everything will continue as normal

Kevin S. |
5.0 5.0 (4 lesson ratings) (4)
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Same way you would it "a" was a number instead of a variable:

(ab)(ab) + (8)(ab) - (9)(ab) - (9)(8)

a2b2 - ab - 72