Question

(x-4)(x+4)=200

Answer 1

=>x(x+4)-4(x+4)=200

=>x²+4x-4x-16=200

=>x²=16+200

=>x²=216

=>x=\(\sqrt{216}\)

Answer 2

(x-4)(x+4)=200

=>x.(x+4)-4.(x+4)=200

=>x^2+4x-4x-16=200

=>x^2=200+16=216

=>x \(\sqrt{216}=6\sqrt{6}\)

Answer 3

(x-4)(x+4)=200
=>x-4=200 hoặc x+4=200
=> x=204 hoặc x=196
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Answer 4

=> x²-16=200

=>x²=216

=>x=căn 216