Question

(20.7)² : evaluate using expansion of (a+b) ²or (a-b)²
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Answer 1

Step-by-step explanation:

(20.7)^2= (20+0.7)^2

= (20)^2+(0.7)^2+2.20.0.7

= 400+0.49+28

= 428.49

Answer 2

Answer:

(20.7)^2=(20)^2+(0.7)^2+2×20×0.7

=400+0.49+28

Answer =428.49

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