Please help me with these 3 questions..
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Step-by-step explanation:
a = 2, b = -2
1. a²+b²
= 2² + (-2)²
= 4 + 4
= 8
2. a² + ab + b²
= 2² + 2×-2 + (-2)²
= 4 -4 + 4
= 8 - 4
= 4
3. a²-b²
= 2² - (-2)²
= 4 - 4
= 0
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