Question

Find the square of 2a - 4b + 5c.​

Answer 1

Answer:

4a square +16bsquare+25c square

Answer 2

$\bold{\underline{\:Answer:-}}$

$\implies\:(2a-4b+5c)^2$

$\implies\:(2a)^2+(-4b)^2+(5c)^2+2×(2a)(-4b)+2(-4b)(5c)+2(5c)(2a)$

$\implies\:(4a^2+16b^2+25c^2-16ab-40bc+20ca)$

Important Formula :-

$\bold{\boxed{\:(x+y+z)^2\:=\:(x^2+y^2+z^2+2xy+2yz+2zx)}}$