Question

from the sum of x²+x+1 and x²-x+1, subtract -x²-x+1​

Answer 1

Answer:

3x²+x+1

Step-by-step explanation:

refer to the attached file

Answer 2

Answer:

3x² + x + 1

Step-by-step explanation:

Sum of (x² + x + 1) and (x² - x + 1) :

→ (x² + x + 1) + (x² - x + 1)

Open the brackets.

→ x² + x + 1 + x² - x + 1

Write the common terms together.

→ x² + x² + x - x + 1 + 1

→ 2x² + 2

Subtract (- x² - x + 1) from (2x² + 2) :

→ (2x² + 2) - (- x² - x + 1)

Open the bracket.

→ 2x² + 2 + x² + x - 1

Write the common terms together.

→ 2x² + x² + x + 2 - 1

→ 3x² + x + 1

• Whenever there is a (+) sign outside the bracket, the sings of the terms doesn't changes while opening the bracket.
• Whenever there is a (-) sign outside the bracket, the sings of the terms changes while opening the bracket.