Question

Select all the expressions that are equivalent to 5x^2+8x+2. ??

1) 3x^{2}+x+2x^{2}+2+7x
2) 8x^{2}+4x-3x^{2}+4-3x
3) 2+12x+x^{2}-4x+5^{2}
4)2+12x+x^{2}-4x+5^{2}

Answer 1

Explanation:

if there are no typos then only 1) is correct.

3x² + 2x² = 5x²

x + 7x = 8x

2 = 2

2)

8x² - 3x² = 5x²

4x - 3x = x

4 = 4

wrong

3)

x² + 5x² = 6x²

12x - 4x = 8x

2 = 2

wrong

4)

is the same as 3)

so, I am sure the original problem description has something else here. be careful - the original might be another correct answer here.