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nadya68 [22]
4 years ago
13

IMPORTANT HELP HURRY

Mathematics
1 answer:
Zanzabum4 years ago
6 0
Let Bea = x
Therefore Andrew = x + 2
Chris = x - 3

Andrew * Chris = 66
(x + 2)(x - 3) = 66 Remove the brackets.
x^2 + 2x  - 3x - 6 = 66
x^2 - x - 6 = 66 Subtract 66 from both sides.
x^2 - x - 72 = 0
(x - 9)(x + 8) = 0
Find the possible values of Bea's age

x - 9 = 0
x = 9 That value works. She can be plus 9 years old.

x + 8 = 0
x = - 8. There's no way she can be - 8 years old
  
So Bea is 9. 
9 <<<<<< Answer
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8 0
3 years ago
If f(x) = x-5 and g(x) = 3x2-1,<br> what is (fºg)(x)?
Kobotan [32]

Answer:

<h2>(f\circ \: g)(x) =  {3x}^{2}  - 6</h2>

Step-by-step explanation:

f(x) = x - 5

g(x) = 3x² - 1

To find (fºg)(x) substitute g(x) into f(x) that's for every x in f (x) replace it with g (x)

That's

<h3>(f\circ \: g)(x) = 3 {x}^{2}  -1 - 5</h3>

We have the final answer as

<h3>(f\circ \: g)(x) =  {3x}^{2}  - 6</h3>

Hope this helps you

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