Question

what is the solution set of the equation x²-49=0?
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Answer 1

$\huge\fcolorbox{aqua}{cyan}{\huge\underline{Answer}}$

$x {}^{2} - 49 \: = 0 \\ x {}^{2} = 49 \\ x = \sqrt{49} \\ x = \sqrt{7 \times 7} = 7 \\ x = 7$

Answer 2

$\huge{\mathcal{\underline{\red{Answer}}}}$

$x {}^{2} - 49 = 0 \\ x {}^{2} = 49 \\ x = \sqrt{49} \\ x =  ±7$

It means x can be 7 and can be -7