raghav and devanshu factorised an algebraic expression and obtained the factors as given below. Raghav- 81y² - 225z²=( 9y -15z) ( 9y - 15z) devanshu- 81y² - 225z²= (9y- 15z) (9y+15z) compare their answers to find out whoes obtained the correct answer and give reason incorrect answer
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