Question 451243

1. 

a.

{{{3x^2+4x^2=35}}}

{{{7x^2=35}}}

{{{x^2=35/7}}}

{{{x^2=5}}}

{{{x}}}=-+{{{sqrt(5)}}}=-+{{{2.2}}}


b.

{{{3x^2-28=2x^2+33}}}

{{{3x^2-2x^2=28+33}}}

{{{x^2=61}}}

{{{x}}}=-+{{{sqrt(61)}}}=-+{{{7.8}}}

c.

{{{x^2-25=50}}}

{{{x^2=25+50}}}

{{{x^2=75}}

{{{x}}}=-+{{{sqrt(75)}}}=-+{{{8.7}}}