Algebra
posted by Daleda .
Please help me to solve these two equations step by step. They are quadratic equations
1).2x^2+9x+4=0
2).5x^2=7x

write them so all the x variables are on one side
0 = 2x^2 + 9x  4 and 0 = 6x^2  x  2
if you can, factor out any common factors (in this case, you can not for either equation)
You could use the quadratic formula or just a little trial and error to factor the equations.
The first one is easy to factor using trial and error
What factors of 2 and 4 would multiply then add up to 9? Factors for 2 are 2, 1, 1, 2 and factors for 4 are 4, 1, 2, 2, 1, 4
Plug any of those combinations in the formula x 0 = (?x+?)(?x+?)
In this case, 0 = (2x+1)(x4), then make each paretheses equal to 0 and solve for x (solution: x = 1/2 or 4)
Both equations would probably be more easily solved using the quadratic formula xoxo gothgirl kk 
hope that helps :D