Question

maths formulas 7th std please​

Answer 1

Step-by-step explanation:

(a+b)²=a²+2ab+b²

a²-b²=(a+b)(a-b)

(a+b)²+(a-b)²=2(a²+b²)

(a+b²)-(a-b)²=4ab

Answer 2

Answer:

1) (a+b)^2=a^2+2ab+b^2

2) (a-b)^2=a^2-2ab+b^2

3) (a+b)(a-b)=a^2-b^2

4) (x+a)(x+b)=x^2+(a+b)x+ab

5) (x-a)(x-b)=x^2-(a+b)x+ab

6) (x+a)(x-b)=x^2-(b-a)x-ab

7) (x-a)(x+b)=x^2(a-b)x-ab

8)[a] (a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca

[b] (a+b-c)^2=a^2+b^2+c^2+2ab-2bc-2ca

[c] (a-b+c)^2=a^2+b^2+c^2-2ab-2bc+2ca

[d] (-a+b+c)^2=a^2+b^2+c^2-2ab+2bc-2ca

9) (a+b)^3=a^3-3a^2b+3ab^2-b^3

{or}

=a^3+b^3+3ab(a-b)

10) (a-b)^3=a^3-b^3-3ab(a-b)

{or}

=a^3-b^3-3ab(a-b)

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