1.
x=-2/5 or x=3/4
x+2/5=0 or x-3/4=0
(x+2/5)(x-3/4)=0
x(x-3/4)+2/5(x-3/4)=0
x^2-3x/4+2x/5-3/4=0
x^2-7x/20-3/4=0
multiply both sides by 20
20x^2-7x-15=0
2.
8y^2-10y+3=0
8*3=24
8y^2-6y-4y+3=0
2y(4y-3)-1(4y-3)=0
2y-1=0 or 4y-3=0
2y=1 or 4y=3
y=1/2 or 3/4
1 month ago
=x^2 +7/20x - 3/10
Multiply through by 20
=20x^2 + 7x - 6.