The solution of x is +12 and -12.
Step-by-step explanation:
Given,
[tex]3x^{2}+4 = 436[/tex]
To find the values of x
[tex]3x^{2} +4 = 436[/tex]
or, [tex]3x^{2} = 436-4[/tex]
or, [tex]3x^{2} = 432[/tex]
or, [tex]x^{2} = \frac{432}{3}[/tex]
or, [tex]x^{2} = 144[/tex]
or, x= ±[tex]\sqrt{144}[/tex] [ a square root has two values, so we put ± sign]
or, x = ±12
