Question

evaluate (7.8)²- (2.2)²​

Answer 1

(7.8)²=60.84

(2.2)²=4.84

60.84-4.84=56.00

56

or

it is in the form of a²-b²=(a+b)(a-b)

=(7.8+2.2)(7.8-2.2)

=(10)(5.6)=56

hence proved

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Answer 2

Answer: 56

Step-by-step explanation:

We know,

a^2-b^2=(a+b)(a-b)

Here, a=7.8 & b=2.2

(7.8)^2-(2.2)^2

=(7.8+2.2)(7.8-2.2)

=10×5.6

=56

HOPE IT HELPS

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ZunayedTIME