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Answer:
(x+81)²
Step-by-step explanation:
this is a perfect square trinomial
but we need to find if its 3 check
x²✓
18✓
81✓
so it is really a perfect square no let's solve
step 1: identify if it's PST✓
step 2: solve
x²+18+81
(x+81)²
step2:solve✓
step 3:check
(x+81)(x+81)
x²+18+81
step3:check✓
so the answer is: (x+81)²