Question

what is the value of (7.8)²- (2.2)²​

Answer 1

Answer:

(7.8*7.8) - (2.2 * 2.2)=60.84- 4.84=56.

Step-by-step explanation:

(7.8*7.8)=60.84

2.2 * 2.2=4.84

then subtract both = 56 answer

answer=56............

Answer 2

Answer:

56

Step-by-step explanation:

$a^{2}-b^{2}=(a+b)(a-b)$

$7.8^{2} -2.2^{2} =(7.8+2.2)(7.8-2.2)\\=10(5.6)\\=56$