## anonymous one year ago Solve 2x^2 - 20 = 3x.

1. anonymous

THere are many ways my prefer way is to use quadratic formula. Depending on what they want u to use tho they may not like it. BUT 2x2 - 20 = 3x 2x2 - 20 - 3x=0 just subtract 3x from both sides. 2x2 - 3x -20 =0 rearrange now use quadratic equation ax2 + bx +c =0 2x2 - 3x -20

2. anonymous

3. anonymous
4. anonymous

2 is a -3 is b -20 is c Can you handle that :)

5. anonymous

$2x^{2}-20=3x$

6. anonymous

$2x ^{2}-3x-20=0$

7. anonymous

$2x ^{2}-8x+5x-20=0$

8. anonymous

$2x(x-4)+5(x-4)=0$ $\therefore (2x+5)(x-4)=0 \rightarrow x=-2.5 or 4$