Question

[tex]4a {}^{2} + b {}^{2} + 25c {}^{2} - 4ab -10bc - 2ca

Answer 1

Hello....!!!

(a+b+c)² = a²+b²+c²+2ab+2bc+2ca

4a²+b²+25c²-4ab-10bc-20ca
= (2a)²+(b)²+(5c)²-2(2a)(b)-2(b)(5c)-2(5c)(2a)
=( 2a-b-5c)²

Hope this helps....!!!

^_^