Answer:
Step-by-step explanation:
- 4x² - 36x + 81 = 0
- (2x)² - 2*2x*9 + 9² = 0 Identity a² - 2ab + b² = (a - b)²
- (2x - 9)² = 0
- 2x - 9 = 0
- 2x = 9
- x = 4.5
Ans
x = -24
x = 6 2/3
workings in the pic below :)
sry if it’s incorrect
21: The factors of 21 are 1,3,7,21