Question

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Answer 1

(a+b+c)^2

= a^2+b^2+c^2+2ab+2bc+2ca

therefore

(x-2y+5z)^2

= x^2+4y^2+25z^2-2xy-20yz+10xz

Answer 2

Answer:

${x}^{2} + {4y}^{2} + {25z}^{2}$