7. Exemplar - Factorize

Factorise:
 
\(25x^2 + 16y^2 + 4z^2 – 40xy + 16yz – 20xz=\)
 
Answer variants:
\((4x-2y+3z)^2\)
\((-5x+4y+2z)^2\)
\((4x-2y-3z)^2\)
\((3x+4y-4z)^2\)
\((3x-4y-4z)^2\)
\((5x+4y-2z)^2\)
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