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3 years ago

I want to how they answer this question. What is the value of x?

Mathematics

1 answer:

mestny [16]3 years ago

4 0

√(15+x) = 2x+3
take sqr for both side

15x+10=(2x+3)^2

15x+10=4x^2+9+2*2x*3
15x+10=4x^2+9+12x
4x^2-3x--1=0

solve it u will x=1,-1/4

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Step-by-step explanation:

Given

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Required

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Given that thee variation is inversely proportional;

This implies that

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Convert variation to equation

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Substitute 7 for y and 9 for x in equation 1

$7 = \frac{k}{9}$

Multiply both sides by 9

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Substitute 63 for k in equation 1

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Solving for when x = 21

Substitute 21 for x in the above equation

$21 * y = 63$

Divide both sides by 21

$\frac{21 * y}{21} = \frac{63}{21}$

$y = 3$

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