Question

what r the formulas and corollaries of algebra class 7​

Answer 1

Step-by-step explanation:

(x+y) ²=x²+2xy +y²

x²-y²= (x+y) (x-y)

(x-y)²= x²-2xy+y²

(x+a) (x+b) = x²+ (a+b)x +ab

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Answer 2

$\underline{\underline{\huge{\pink{\tt{\textbf Answer :-}}}}}$

•a² – b² = (a-b)(a+b)

•(a+b)² = a² + 2ab + b²

•(a-b)² = a² – 2ab + b²

•a² + b² = (a-b)² +2ab

•(a+b+c)² = a²+b²+c²+2ab+2ac+2bc

•(a-b-c)² = a²+b²+c²-2ab-2ac+2bc

•a³-b³ = (a-b) (a² + ab + b²)

•a³+b³ = (a+b) (a² – ab + b²)

•(a+b)³ = a³+ 3a²b + 3ab² + b³

•(a-b)³ = a³- 3a²b + 3ab² – b³