Which expression correctly factors the polynomial?
9x2 - 49
a. (3x – 7)?
b. (3x – 7)(3x + 7)
c. (9x + 7)(x - 7)
d. (9x - 7)(x + 7)

Areflection of shape i across the y-axis, followed by a , and then a translation left 6 units and down 4 units confirms congruence between shape i and shape ii. alternatively, a of shape ii about the origin, followed by a reflection across the y-axis, and then a translation right 4 units and up 6 units confirms congruence between shape ii and shape i.