Question

Find the following squareusing identities. 1) (0.4p -0.5q)2​

Answer 1

Answer:

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Step-by-step explanation:

we use (a-b)^2=a^2+b^2-2ab

here a=0.4p and b=0.5q

(0.4p-0.5q)^2

=(0.4p)^2+(0.5q)^2-2×0.4p×0.5q

=0.16p^2+0.25q^2-0.2pq

This is final answer

Answer 2

Answer:

As we know (a-b)^2 = a^2 + b^2 - 2ab

Step-by-step explanation:

(0.4p - 0.5q) ^2

By applying the identity given above, we have,

=(0.4p) ^2 + (0.5q) ^2 - (2)*(0.4p)*(0.5q)

=0.16p^2 + 0.25q^2 - 0.4pq

16p^2 + 0.25q^2 - 0.4