(x+4)^{2}=x^{2}+8x+16
(4.5-7)^{2} =9x^{2} -20.5+49
(5x-3)(5x+3)=5x^{2} -9
(2x+6)^{2} =2x^{2} +24+36
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(x+4)^{2}=x^{2}+8x+16
(4.5-7)^{2} =9x^{2} -20.5+49
(5x-3)(5x+3)=5x^{2} -9
(2x+6)^{2} =2x^{2} +24+36