Question

Question 2

2
o
Which expression is equivalent to 2x2 – 2 + š?
ОА 2(x - 1)?
2(x - 1)
2(x – 3)?
2(x - 1)?
B
с
D

Answer 1

Explanation:

the first is

2(x - 1/2)² = 2(x² - 2×1/2×x + 1/4) = 2x² - 2x + 1/2

so, no, this is not the same.

the second is

2(x - 1/4)² = 2(x² - 2×1/4×x + 1/16) = 2x² - x + 1/8

that is the correct answer.

the third is

2(x - 1/8)² = 2(x² - 2×1/8×x + 1/64) = 2x² - 1/2 x + 1/32

so, no, this is not the same.

the fourth is

2(x - 1/16)² = 2(x² - 2×1/16×x + 1/256) = 2x² - 1/4 x + 1/128

so, no, this is not the same.