Answered

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How do I solve: x^2+3=84.

Sagot :

ItsDingy

Answer:

x=9, x=-9

Step-by-step explanation:

subtract 3 from both sides

x^2=81

then squareroot both sides (remember that there is a positive and negative solution!)

x=9, x=-9

38571218

Answer:

x = -9

x = 9

Step-by-step explanation:

[tex]x^{2} + 3 = 84[/tex]

Subtract 84 from both sides.

[tex]x^{2} + 3 - 84 = 0[/tex]

Subtract 84 from 3 to get −81.

[tex]x^{2} - 81 = 0[/tex]

Consider [tex]x^{2}[/tex] - 81. Rewrite [tex]x^{2} - 81[/tex] as [tex]x^{2} - 9^{2}[/tex]. The difference of squares can be factored in using the rule: [tex]a^{2} - b^{2} = ( a- b) ( a+ b)[/tex].

[tex](x - 9) (x + 9) = 0[/tex]

To find equation solutions, solve [tex]x - 9 = 0[/tex] and [tex]x + 9 = 0[/tex]

x = 9

x = -9

Hope it helps and have a great day! =D

~sunshine~

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