Question

Which of the following expression cannot be factored out using difference of two square

Answer 1

Answer:

d

Step-by-step explanation:

Factoring using difference of squares

a² - b² = (a - b)(a + b)

a

x² - 1

= x² - 1²

= (x - 1)(x + 1)

b

x² - y²

= (x - y)(x + y)

c

x² - 4

= x² - 2²

= (x - 2)(x + 2)

d

4 - 16y ← 16y is not a perfect square and so cannot be factored

If it was 4 - 16y² then it could be factored using difference of squares