$16-8\sqrt 7x +7x$
Work Step by Step
$(4-\sqrt 7x)(4-\sqrt 7x)$ Original problem FOIL $(4)(4)+(4)(-\sqrt 7x)+(4)(-\sqrt 7x)+(-\sqrt 7x)(-\sqrt 7x)$ Or $16-4\sqrt 7x-4\sqrt 7x+7x$ Combine like terms $16-8\sqrt 7x +7x$
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