2p^2-7p-9=0

Solution for 2p^2-7p-9=0 equation:

2p^2-7p-9=0

a = 2; b = -7; c = -9;
Δ = b2-4ac
Δ = -72-4·2·(-9)
Δ = 121
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$p_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$p_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{121}=11$
$p_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-7)-11}{2*2}=\frac{-4}{4}
=-1
$
$p_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-7)+11}{2*2}=\frac{18}{4}
=4+1/2
$