tadhanala
4√x+9 (end of sqrt) = 20



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03453660
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\[4\sqrt{x+9} = 20\]

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is this the question??

tadhanala
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Yes

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ok so squaring bothsides we get
16(x+9) = 400
x+9 = 400/16
x+9 = 25
x = 25  9
x = 16 > required solution

tadhanala
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Thank you!

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welcome