Algebra
posted by Trevor .
Hi,
I have had to factorise the equation
x^2 + x  30 = 0, which I think I have worked the answer out as x =6, x =5?
I now need to explain how I can use this answer to solve the equation
4x^2 +4x 120 =0
Any advice?

You would take your answers and plug them in to the equation.
4(6^2)+4(6)120=0
and
4(5^2)+4(5)120=0
then work out the problems and if you are correct 0=0
Hope this helped
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