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2 years ago

Simplify each expression, if possible. 13. (2+ 5xi)(7- xi)

Mathematics

1 answer:

vaieri [72.5K]2 years ago

4 0

Answer:

Step-by-step explanation:

(2+5xi)(7-xi)=2(7-xi)+5xi(7-xi)

=14-2xi+35xi-5x²i²

=14+33xi-5x²(-1)

=14+33xi+5x²

=14+5x²+33xi

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Answer:

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Step-by-step explanation:

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A is directly proportional to b. When a is 6, b is 72. Find b when a is 8. 3

adelina 88 [10]

Answer:

a) "K" is proportional Constant K= 0.0833

b) The value of b = 99.639

Step-by-step explanation:

Explanation :-

Given 'a' is directly proportional to 'b'

a ∝ b

a = k b ....(i)

where "K" is proportional Constant

Case(i):-

when a =6 and b=72

a = k b

⇒ 6 = k (72)

⇒ $K = \frac{6}{72} = \frac{1}{12} = 0.0833$

Case(ii):-

Given a = 8.3

a = k b

⇒ 8.3 = 0.0833 ×b

⇒ $b = \frac{8.3}{0.0833} = 99.639$

Final answer:-

a)"K" is proportional Constant K= 0.0833

b) The value of b = 99.639

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