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Answered

the square root of four times a number is equal to square root of 21 more than the number find the number?​

Sagot :

CHASER27IN

Answer:

So let the number be “x”.

Therefore the equation is;

x² + 4x = 21

x² + 4x - 21 = 0

By quadratic formula,

x = (-b ± √D)/2a

x = (-4 ± √16+84)/2*1

x = -4 ± 10 / 2

x = -14/2 or x = 6/2

[tex]\large\color{orange}\boxed{x = -7 or x = 3}[/tex]

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