Question

Expand using suitable identities (a-2b+4c) ^2

Answer 1

= (a)²+(-2b)²+(4c)²+2(a)(-2b)+2(-2b)(4c)+2(a)(2b)

= a²-4b²+16c²-4ab-16bc+5ab

this is the correct answer

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Answer 2

Answer:

formula=(x+y+z)2=x2+y2+z2+2xy+2yz+2zx

Step-by-step explanation:

question=(a-2b+4c)2

=a2+(-2b)2+(4c)2+2.a.2b+2.2b.4c+2.4c.a

=a2+4b2-16c2+4ab+8bc+8ca

thank u

I hope it will be helpful to you