Question 4 (i)

If a = 2, b = -2, find the value of:
$a^{2} + b^{2}$

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Solution

$a^{2} + b^{2} = (2)^{2} + (- 2)^{2}$ [Putting a = 2, b = -2]
= 4 + 4 = 8

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Question 4 (ii)

If a = 2, b = -2,find the value of:
$a^{2} + a b + b^{2}$

Question 4 (iii)

If a = 2, b = -2, find the value of:
$a^{2} - b^{2}$

a = 2, b = - 2

a^{2} - b^{2}

If a = 2, b = − 2, find the value of:

(i) a²+ b² (ii) a² + ab + b² (iii) a² − b²

a = 2, b = - 2

a^{2} + b^{2}

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