Question

Expansion:-
(3x + 5y +2z) (3x - 5y+2z)​

Answer 1

a=3x+2z

b= 5y

(3x+2z)^2 -(5y)^2

using indentity third = a^2 -b^2=(a+b) (a-b)

Then ,a=3x and b=2z

(3x)^2 +2*3x*2z+2z^2 -25y^2

using indentity first =(a+b)^2 = a^2+2ab+b^2

=9x^2+12xy+4z ^2 -25y^2 ans

Answer 2

Answer:

(3x + 5y +2z) (3x - 5y+2z)

Step-by-step explanation:

(3x + 5y +2z) (3x - 5y+2z)

={(3x-5y)-(2z)}{(3x-5y)+(2z)}

=(3x-5y)²-(2z)²{since (a+b) (a-b) = a²-b²}

=9x²+25y²-2×3x×5y-4z²

=9x²+25y²-30xy-4z²

=9x²+25y²-4z²-30xy