Question

The sum of 8x^2-x+4 and x-5 is

1) 8x^2+9
2)8x^2-1
3)8x^2-2x+9
4)8x^2-2x-1
Please explain how you got your answer

Answer 1

Option 2

Explanation:

8x²-x+4

+ x-5

=

8x²-1

Answer 2

8x² - 1

Explanation:

Summing the 2 expressions together gives

8x² - x + 4 + x - 5 ← collect like terms

= 8x² + (- x + x) + (4 - 5)

= 8x² + 0 + (- 1) = 8x² - 1