Question

1- what must be subtracted from 7x - 5y + z² to get z² + 3y - 2x²
2- Add - (3a³-3ab+2b² + 7b²+11ab-8a³+8)
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Answer 1

Step-by-step explanation:

1. __________ - 7x - 5y + z² = z² + 3y - 2x²

= z² + 3y -2x² + 5y - z² + 7x

= 8y - 2x² + 7x

2. -3a³ + 3 ab - 2b² - 7b² - 11ab + 8a³ - 8

( all signs are changed becuase there is - in front of whole bracket )

hence , 5a³ - 8 ab - 9b² - 8

HOPE YOU UNDERSTOOD

Answer 2

Answer:

1) Let the number be x

   ⇒ (7x - 5y + z²) - (x)  = (z² + 3y - 2x²)

   ⇒ (x) = (z² + 3y - 2x²) - (7x - 5y + z²)

   ⇒ (x) = (-2x² -7x -2y)

Therefore,  (-2x² -7x -2y) must be subtracted...

2)  - (3a³-3ab+2b² + 7b²+11ab-8a³+8)

    ⇒  (-3a³-3ab+2b²) + (7b²+11ab-8a³+8)

    ⇒  (-11a³ + 8ab + 9b² + 8)

Therefore, answer is  (-11a³ + 8ab + 9b² + 8)

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