solve this simple questions on ur notebook to get brainliest for sure
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solve this simple questions on ur notebook to get brainliest for sure
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ANSWERS :
(b) (7x² - 7) - (x² + 7x - 7) - (5x² + x)
= 7x² - x² - 5x² - 7 - 7 + 7x + x
= x² - 14 + 8x
⇒ x² + 8x - 14
(d) 2(3m - 2n) - 6(m - 2n)
= 6m - 4n - 6m + 12n
= 6m - 6m - 4n + 12n
⇒ 8n
(c) -c(c + a)
⇒ -c² - ac
(b) x - 2y - [4x - y - {x - 2z -(x + 2y)}]
= x - 2y - [4x - y- {x - 2z - x + 2y}]
= x - 2y - [4x - y - x - 2z - x + 2y]
= x - 2y - 4x - y - x - 2z - x + 2y
= x - 4x - x - x - 2y + 2y - y - 2z
= -5x - y - 2z
⇒ -5x - 2z - y
(d) -m² - [m - {m² + 3m - (4m - m² - 2m - 3m²)}]
= -m² - [m - {m² + 3m - 4m - m² - 2m - 3m²}]
= -m² - [m - m² + 3m - 4m - m² - 2m - 3m²]
= -m² - m - m² + 3m - 4m - m² - 2m - 3m²
= -m² - m² - m² - 3m² - m + 3m - 4m - 2m
⇒ -6m² - 4m
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