1.

ADVANCED LEVELx² + y2 – z2 + 2xy7. Simplify x² - y2 – 2² – 2yz'​

Answer»

Step-by-step explanation:

x²+y²+2xy =( x+y)²

total:(x+y)²-z²

simplify USING (a+b)(a-b)=a²-b² identity

let x+y=a & z=b

a²-b²

(x+y+z)(x+y-z) is SIMPLIFIED form

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