STEP 1 Write the expression in the form (1 + x)n
STEP 2 Expand and simplify
Use a line for each term to make things easier to read and follow
Use brackets - fractions and negatives get ugly!
STEP 3 If required, check and state the validity statement
STEP 1 Write the expression in the form (1 + bx)n
STEP 2 Replace “x” by “bx” in the expansion
Check carefully to see if b is negative
STEP 3 Expand and simplify
Use a line for each term to make things easier to read and follow
Use brackets
STEP 4 If required, check and state the validity statement
The validity statement changes
Replace “x” with “bx” so now |bx| < 1
转载自savemyexams
© 2024. All Rights Reserved. 沪ICP备2023009024号-1