Question

we can evaluate 40² -30², using the identity
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Answer 1

Answer:

700

Step-by-step explanation:

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

40^2-30^2=(40+30)(40-30)

=(70)(10)

=700

Answer 2

Answer:

using a²-b²=(a+b)(a-b)

40²-30²=(40+30)(40-30)

=70*10

= 700

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