Question

find the value of (2.8×2.8+2×2.8×2.2+2.2×2.2) is

Answer 1

107.8352 is the answer.

I think it's very simple

Answer 2

SOLUTION

TO DETERMINE

The value of

(2.8×2.8+2×2.8×2.2+2.2×2.2)

FORMULA TO BE IMPLEMENTED

We are aware of the formula that

$\sf{ {(a + b)}^{2} = {a}^{2} + 2ab + {b}^{2} }$

EVALUATION

2.8×2.8+2×2.8×2.2+2.2×2.2

$\sf{ = {(2.8)}^{2} + 2 \times 2.8 \times 2.2 + {(2.2)}^{2} }$

$\sf{ = {(2.8 + 2.2)}^{2} }$

$\sf{ = {(5)}^{2} }$

$= 25$

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