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Serjik [45]
3 years ago
7

Please help me with my math homework​

Mathematics
1 answer:
zheka24 [161]3 years ago
8 0

Answer

x=45

Explanation

2x + 45 + x = 180

3x + 45 = 180

     -45      -45

3x = 135

/3       /3

x=45

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Nimfa-mama [501]

Answer:

(f + g)(x) = 12x² + 16x + 9 ⇒ 3rd answer

Step-by-step explanation:

* Lets explain how to solve the problem

- We can add and subtract two function by adding and subtracting their

 like terms

Ex: If f(x) = 2x + 3 and g(x) = 5 - 7x, then

     (f + g)(x) = 2x + 3 + 5 - 7x = 8 - 5x

     (f - g)(x) = 2x + 3 - (5 - 7x) = 2x + 3 - 5 + 7x = 9x - 2

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∵ f(x) = 12x² + 7x + 2

∵ g(x) = 9x + 7

- To find (f + g)(x) add their like terms

∴ (f + g)(x) = (12x² + 7x + 2) + (9x + 7)

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∴ (f + g)(x) = 12x² + (7x + 9x) + (2 + 7)

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