Assume that y varies directly as x.

if y = 3, when x = 15, find the value of y when x = 75.

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a

Me n o w. i need t h i s. 10 points