43. What is the proof that (a+b)2=a2+2ab+b2

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Q. Prove that:

(a + b)^{2} = a^{2} + 2 a b + b^{2}

Which of the following is correct?
a) $(a - b)^{2} = a^{2} + 2 a b - b^{2}$
b) $(a - b)^{2} = a^{2} - 2 a b + b^{2}$
c) $(a - b)^{2} = a^{2} - b^{2}$
d) $(a + b)^{2} = a^{2} + 2 a b - b^{2}$

Q. Question 3

Which of the following is correct?
a)

(a - b)^{2} = a^{2} + 2 a b - b^{2}

(a - b)^{2} = a^{2} - 2 a b + b^{2}

(a - b)^{2} = a^{2} - b^{2}

(a + b)^{2} = a^{2} + 2 a b - b^{2}

If $(a + b)^{2} = a^{2} + 2 a b + b^{2}$ then what is the value of $a^{2} + b^{2}$

Q. What is the expansion for the identity

{(a - b)}^{2}

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