36{a}^{2}+{a}^{4}-1296-36{a}^{2}-{({a}^{2})}^{2}+2{a}^{2}\times 18-{18}^{2}36a2+a4−1296−36a2−(a2)2+2a2×18−182
{({x}^{a})}^{b}={x}^{ab}(xa)b=xab
36{a}^{2}+{a}^{4}-1296-36{a}^{2}-{a}^{4}+2{a}^{2}\times 18-{18}^{2}36a2+a4−1296−36a2−a4+2a2×18−182
Simplify {18}^{2}182 to 324324
36{a}^{2}+{a}^{4}-1296-36{a}^{2}-{a}^{4}+2{a}^{2}\times 18-32436a2+a4−1296−36a2−a4+2a2×18−324
Simplify 2{a}^{2}\times 182a2×18 to 36{a}^{2}36a2
36{a}^{2}+{a}^{4}-1296-36{a}^{2}-{a}^{4}+36{a}^{2}-32436a2+a4−1296−36a2−a4+36a2−324
Collect like terms
(36{a}^{2}-36{a}^{2}+36{a}^{2})+({a}^{4}-{a}^{4})-1296-324(36a2−36a2+36a2)+(a4−a4)−1296−324
Simplify
36{a}^{2}-1296-32436a2−1296−324
Simplify
36{a}^{2}-162036a2−1620