Question

From -9dcd^2,subtract -2cd^2

Answer 1

-7cd²

1) Subtracting -2 cd² from -9cd² we have:

-9cd² - (-2cd²) A minus prior to the parentheses changes its sign

-9cd² + 2cd² Proceed with the operation

-7cd²

2) Hence, the answer is -7cd²