Question

By using identity
[2xy+5yz+7zx]²
Pls tell the answer fast.... ​

Answer 1

Answer:

4x²y²+25y²z²+49z²x²+2[xyz(14x+10y+35z)]

Step-by-step explanation:

we know that [a+b+c]²=a²+b²+c²+2[ab+bc+ca]

[2xy+5yz+7zx]²=(2xy)²+(5yz)²+(7zx)²+2[2xy(5yz)+5yz(7zx)+7zx(2xy)]

                        =4x²y²+25y²z²+49z²x²+2[10xy²z+35xyz²+14x²yz

                        =4x²y²+25y²z²+49z²x²+2[xyz(14x+10y+35z)]    

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