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Dahasolnce [82]
3 years ago
13

ASAP! GIVING BRAINLIEST! Please read the question THEN answer CORRECTLY! NO guessing. Show your work OR give an explaination.

Mathematics
1 answer:
sertanlavr [38]3 years ago
5 0

Answer:

D. 4 {x}^{2}  +  \frac{9x}{4}  - 7

Given:

f(x) =  \frac{x}{4}  - 3 \\  \\ g(x) = 4 {x}^{2}   +  2x - 4

To Find:

(f + g)(x) = f(x) + g(x)

Step-by-step explanation:

=  > f(x) + g(x) =  (\frac{x}{4}  - 3) + (4 {x}^{2}  + 2x - 4) \\  \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: = \frac{x}{4}  - 3 + 4 {x}^{2}  + 2x - 4\\  \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  =4 {x}^{2}  + 2x +  \frac{x}{4}  - 7\\  \\   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: =4 {x}^{2}  + \frac{8x}{4}  +  \frac{x}{4}  - 7\\  \\ \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  =4 {x}^{2}  +  \frac{8x + x}{4}  - 7 \\  \\   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: =4 {x}^{2}  +  \frac{9x}{4}  - 7

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Step-by-step explanation:

Let x represent Berma's age

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Two years from now, Rinna’s age will be 13 less than the sum of Erwin’s age and twice Berma’s age. This means that

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Three years ago, 15 times Berma’s age was 5 less than the age of Rinna. It means that

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Substituting x= 5 and y = 38 into equation 1, it becomes

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