3 years ago

Help please would be appreciated

Mathematics

1 answer:

noname [10]3 years ago

5 0

Answer:

sorry dont now but thank any way

Step-by-step explanation:

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$1.\\81-4x^2=0\\\\9^2-(2x)^2=0\\\\(9-2x)(9+2x)=0\iff9-2x=0\ \vee\ 9+2x=0\\\\-2x=-9\ \vee\ 2x=-9\\\\x=4.5\ \vee\ x=-4.5$

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