Question

Find the sum of the following expressions.
(i) x² – 3x-1,3x + 2x +9
(iii) -2 -3a + 4a +6,2a + 5a +7​

Answer 1

Given:

1.  x² - 3x - 1, 3x + 2x + 9
2. -2 - 3a + 4a + 6, 2a + 5a + 7​

What To Find:

We have to the sum of these expessions.

Solution:

1.  x² - 3x - 1, 3x + 2x + 9

⇒ (x² - 3x - 1) + (3x + 2x + 9)

Remove the brackets,

⇒ x² - 3x - 1 + 3x + 2x + 9

Rearrange the like terms,

⇒ x² - 3x + 3x + 2x - 1 + 9

Solve the like terms,

⇒ x² + 2x + 8

∴ So, the sum of the expressions is  x² + 2x + 8.

2. -2 - 3a + 4a + 6, 2a + 5a + 7​

⇒ (-2 - 3a + 4a + 6) + (2a + 5a + 7​)

Remove the brackets,

⇒ -2 - 3a + 4a + 6 + 2a + 5a + 7​

Rearrange the like terms,

⇒ -3a + 4a + 2a + 5a - 2 + 6 + 7

Solve the like terms,

⇒ 8a + 11

∴ So, the sum of the expressions is 8a + 11.

Answer 2

Answer:

the sum of expression is 8a + 11

Step-by-step explanation:

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