Question

Expand : ( 1/4a - 1/2b + 1)²
Factorise: x³ - 3x² -9x - 5​

Answer 1

Answer:

(1/4a-1/2b+1)²=(1/4a)²+(-1/2b)²+1²+2(1/4a)(-1/2b)+2(-1/2b)×1+2×1×(1/4a)

=1/16a²+1/4b²+1--1/4ab-1/b+1/2a