Question 1129770
{{{15y^2-50y+35=0}}}
{{{5(3y^2-10y+7)=0}}}
Use the a c method
What 2 numbers have a sum of ac and add to equal b?
ac=21
b=-10
-7,-3
Then put the 2 numbers over c and simplify if possible.
{{{-7/7}}}, {{{-3/7}}}
-1, {{{-3/7}}}
Put it into the equation and remember to always bring the negative to the middle,
5[(1y-1) (3y-7)]=0
1y-1=0, y=1
3y-7=0, 3y=7, y={{{7/3}}}
So the answer is
y=1 and y={{{7/3}}}