SOLUTION: 0.2y^2+0.03y=0.02

Question 164706This question is from textbook
: 0.2y^2+0.03y=0.02 This question is from textbook

Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
0.2y^2+0.03y=0.02
20y^2+3y=2 multiply each side by 100
20y^2+3y-2=0
20*-2=-40. What 2 factors of -40 add up to 3? Ans 8 & -5.
20y^2-5y+8y-2=0
5y(4y-1)+2(4y-1)=0 Factoring by grouping.
(5y+2)(4y-1)=0
5y=-2, 4y=1
y=-2/5, y=1/4
.
Ed

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