Question

Answer is linked below.

Answer 1

A =
`3x² - 7x + 8`

B =
`x² + 8x - 3`

C =
`-5x²-3x + 2`

Lets find B + C - A :

→
`B + C - A`

→
`x² + 8x - 3+ (- 5x²-3x + 2)-(3x² - 7x + 8)`

→
`x² + 8x - 3-5x² - 3x + 2-3x² + 7x - 8`

→
`(1-5-3)x² + (8 -3 + 7)x+ (-3 + 2 - 8)`

→
`- 7x² + 12x - 9`

Answer 2

• - 7x² + 12x - 9

Explanation:

Given:

• A = 3x² - 7x + 8
• B = x² + 8x - 3
• C = - 5x² - 3x + 2

Find B + C - A:

• B + C - A =
• x² + 8x - 3 + (- 5x² - 3x + 2) - (3x² - 7x + 8) =
• x² + 8x - 3 - 5x² - 3x + 2 - 3x² + 7x - 8 =
• (1 - 5 - 3)x² + (8 - 3 + 7)x + (-3 + 2 - 8) =
• - 7x² + 12x - 9