Question

factorise(8.6)sq - ( 1.4) sq help​

Answer 1

Answer:

72

Step-by-step explanation:

(8.6)² - (1.4)². { Note: a²-b²=(a+b)(a-b) }

(8.6 + 1.4)(8.6-1.4)

(10)(7.2)

72