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April 2, 2015

April 2, 2015

Posted by **cathy** on Tuesday, January 14, 2014 at 11:09pm.

a. (2z*3 - 3y*2)*5

b. (3b*2 - 2/b)*14

c. (5x*3 + 3y*2)*8

d. (sqrt.a + sqrt.5)*10

sqrt= square root

- math -
**Reiny**, Tuesday, January 14, 2014 at 11:43pmI will assume that your * means exponent

In most typing notations we use the ^ to show exponents

so your first would be

(2z^3 - 3y^2)^5

you will have to know the expansion for

(a+b)^n = a^n + C(n,1) (a)^(n-1) b + C(n,2) a^(n-2) b^2 + ...

I will do the 2nd and last, you do the others

#2

(3b^2 - 2/b)^14

= (3b^2)^14 + C(14,1) (3b^2)^13 (-2/b) + C(14,2) (3b^2)^12 (-2/b)^2 + ....

= 4782969b^28 + 14(1594323 b^26 (-2/b) + 91(531441 b^24 (4/b^2) + ..

= 4782969 b^28 - 44641044 b^25 + 193444524 b^22 + ...

check my arithmetic

d) (√a + √5)^10

= (√a)^10 + 10(√a)^9 √b + 45(√a)^8 (√b)^2 + ...

= a^5 + 10a^4 √a√b + 45a^4 b + ...

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