Question

factorisex²+4x²+25z²+4xy-20yz-10zx​

Answer 1

x²+4y²+25z²+4xy-20yz-10zx=(x+2y-5z)²

Answer 2

(x+2y-5z)^2

or

(5z-x-2y)^2

hope it helps

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