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Algebra
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13 Dec 2019

If a + b = 7 and c + d = 9, then what is the value of (2c + 2d)(5a + 5b)?

630

6,300

1,260

315

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Patrina Schowalter
Patrina SchowalterLv2
17 Dec 2019
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Related questions

Let u, v, and w be vectors in R^n and let c and d be scalars. Then
a. u+v=v+u. Commutativity
b. (u+v)+w=u+(v+w). Associativity
c. u+0=u
d. u+(-u)=0
e. c(u+v)=cu+cv. Distributivity
f. (c+d)u=cu+du. Distributivity
g. c(du)=(cd)u
h. 1u=u
simplify the given vector expression. Indicate which properties in the thereom above you use.
5(a-2b)+2(5b+a)
5(a-2b)+2(5b+a)=(5a-10b)+(10b+2a) OPTIONS: a. & c., b. & d., c. & f., d.& g., or e. & g.?
=(5a+2a)+(10b-10b) OPTIONS: a. & b., a. & e., a. & f., b. & e., or e. & f.?
=7a

Find all values of a. b. c and d for which A isskew-symmetric

| 0 2a-3b+c 3a-5b+5c|
A = | -2 0 5a-8b+6c |
| -3 -5 d |

Thanks!

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