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third binomial formula problem 1

third binomial formula problem 1


binomial formulas exercise

you can solve the following math problem here: third binomial formula problem 1

If you can solve this problem without a mistake, you are an expert.

The third binomial formula is an important basis in mathematics!

Calculate the following binomials formulas:

a) (11a + 5b) • (11a – 5b) = ?

b) (15rs – 2t) • (15rs + 2t) = ? 

 

a) answer:

(11a + 5b) • (11a – 5b) =  

 a²  –  b²

(11a • 11a) – (5b • 5b) =

121a²  –  25b²

 

b) answer:

(15rs – 2t) • (15rs + 2t) =  

a²  –  b²

(15rs • 15rs) – (2t • 2t) =

225r²s²  –  4t²

 

More exercises:
Two exercise sheets: