Answers: 3
is 
in equation (1),
![=2\left[y^{2}+2(y)(9)+9^{2}\right]](/tpl/images/0323/0575/39e43.png)
![\left[\text { Using }(a+b)^{2}=a^{2}+2 a b+b^{2}\right]](/tpl/images/0323/0575/1f9f9.png)
![\left[\text { since } y=x^{2}\right]](/tpl/images/0323/0575/57c3a.png)
![\left[\text { Using } a^{2}+b^{2}=(a+i b)(a-i b), \text { where } i=\sqrt{-1}\right]](/tpl/images/0323/0575/e0278.png)
![=2[(x+3 i)(x-3 i)]^{2}](/tpl/images/0323/0575/c7bab.png)
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