If a = 2, b=- 2, find the value of: |
(a)\[{{a}^{2}}+{{b}^{2}}\] |
(b)\[{{a}^{2}}+ab+{{b}^{2}}\] |
(c) \[{{a}^{2}}-{{b}^{2}}\] |
Answer:
When a = 2, b = ? 2, then (a) \[{{a}^{2}}+{{b}^{2}}={{\left( 2 \right)}^{2}}+{{\left( 2 \right)}^{2}}\] = 4 + 4 = 8 (b) \[{{a}^{2}}+ab+{{b}^{2}}={{\left( 2 \right)}^{2}}+\left( 2 \right)\text{ }\left( 2 \right)+{{\left( 2 \right)}^{2}}\] = 4 ? 4 + 4 = 4 (c) \[{{a}^{2}}{{b}^{2}}={{\left( 2 \right)}^{2}}{{\left( 2 \right)}^{2}}\] = 4 ? 4 = 0
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