Answer:
x²+14x+49
Step-by-step explanation:
Expand (x + 7)²
=(x+7)(x+7)
=(x)(x)+(x)(7)+(7)(x)+(7)(7)
=x²+7x+7x+49
=x²+14x+49
Answer: x^2 + 49 + 14x
Using identity
a^2 + b^2 + 2ab
a= x
b= 7
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