Question

use suitable identity to find (2xy-5z)^2​

Answer 1

Answer:

(2xy-5z)²= 4x²y²-25z²+20xyz

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Step-by-step explanation:

Using (a-b)²=a²-b²+2ab

(2xy-5z)²=(2xy)²-(5z)²+2(2xy)(5z)

=4x²y²-25z²+20xyz