Question

Trying to solve this one,

20x2+36x-8=0 ???

I found 2 solutions: x = -2
x = 1/5

I pulled out the like factors: 20x2 + 36x - 8 = 4 • (5x2 + 9x - 2)

Split the middle term: 5x2 + 9x - 2

then...-10 + 1 = -9
-5 + 2 = -3
-2 + 5 = 3
-1 + 10 = 9

Did I do this wrong? I'M SOOOO CONFUSED!!!

Answer 1

\[-b \pm \sqrt{b ^{2}-4ac}/2a\]

Answer 2

I rewrote the polynomial splitting the middle term using the two factors found in question, -1 and 105x2 - 1x + 10x - 2...CORRECT?

Answer 3

...

Answer 4

Hello?

Answer 5

Okay...

Answer 6

x = \[9\pm \sqrt{121}/10\]
x = [ 9 ± 11 ) ] / 10
x = 2 , x = - 1/5
OR
(5x + 1)(x - 2) = 0
x = - 1 / 5 , x = 2

Answer 7

for factoring quadratic formula is the best....

Answer 8

you can check your solution by plugging them into the original equation,

if you get 0 = 0 your solutions solve the equation