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Marat540 [252]
1 year ago
9

I subtract 3 from a certain number, multiply the result by 5 and then add 9 if the final result is 54. find the original number

Mathematics
1 answer:
Sergeu [11.5K]1 year ago
8 0

(x-3)\cdot 5+9=54\\5x-15=45\\5x=60\\x=12

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Answer:

j² - 5j²k - 2

Step-by-step explanation:

3j² - j²k - 6 - 4j²k - 2j² + 4

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We have three groups of like terms:

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Remember to include the negatives!

The j-squares are: 3j² ; -2j²

The j-squares k are: - j²k ; - 4j²k

The constants are: - 6 ; 4

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3j² - j²k - 6 - 4j²k - 2j² + 4

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= (- j²k - 4j²k) +  (3j² - 2j²) + (- 6 + 4)

Add or subtract the like terms

= (-5j²k) + (j²) + (-2)

Remove brackets and rearrange so the negative is not first

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Simplify where two signs are together. Adding a negative is subtraction.

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