Answer:
Sum of \[\left( 8a-6{{a}^{2}}+9 \right)\text{ }and\text{ }\left( -l0a-8+8{{a}^{2}} \right)\] \[=(8a-6{{a}^{2}}+9)+(-10a-8+8{{a}^{2}})\] \[=8a-6{{a}^{2}}+9-10a-8+8{{a}^{2}}\] \[=\left( 8{{a}^{2}}-6{{a}^{2}} \right)+\left( 8a-10a \right)+\left( 9-8 \right)\] \[-2{{a}^{2}}-2a+1\] Subtraction of.\[(2{{a}^{2}}-2a+1)\] from -3 \[=-3-\left( 2{{a}^{2}}-2a+1 \right)\] \[=-2{{a}^{2}}+2a-1-3\] \[=-2{{a}^{2}}+2a-4\]
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