solve (3x+y)^2 - (3x-y)^2
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Step-by-step explanation:
Use the indentities (a + b)² = a²+ b² +2ab
And. (a - b)² = a²+ b² +2ab
So, using the indentity
(3x + y)² - (3x - y)²
= (3x² + y²+2•3x•y) - (3x² + y² -2•3x•y)
= (3x²+y²+6xy) - (3x²+y²-6xy)
= 3x² +y² +6xy -3x² -y² +6xy
= 12xy Ans.
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