Solve using the quadratic formula: 8x2 = 6x + 9

Question

anonymous · Answer

i dont undestand how to use the quadratic formula with this. ?

anonymous · Answer

are you guys okay? it's taking a long time

anonymous · Answer

lol there probably showing all the work & explaining it

anonymous · Answer

8x2-6x-9=0

b=-6 a=8 c=-9

b2-4ac= 36+4*8*9= 324
sqrt(324)=18
so x= (6$$\pm$$ 18)/(2*8)= 1.5,-0.75

anonymous · Answer

that is true. got to have some patience. OH we got a winner!!

chaise · Answer

8x^2 = 6x + 9

In order to solve quadratic equations using they MUST be equal to zero. We can rearrange the equation and effectively make it equal to zero by taking away 8x^2 from both sides.

0 = -8x^2+6x+9

This can be factorised to give:

0 = (-2x+3)(4x+3)
x = -3/4
OR
x = 3/2 

I had trouble using the quadratic equation on this equation as the discriminate was under 0.

anonymous · Answer

and the hero finishes strong!