7p^2-15p=-8

Solution for 7p^2-15p=-8 equation:

7p^2-15p=-8

We move all terms to the left:

7p^2-15p-(-8)=0

We add all the numbers together, and all the variables

7p^2-15p+8=0

a = 7; b = -15; c = +8;
Δ = b2-4ac
Δ = -152-4·7·8
Δ = 1
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$p_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$p_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1}=1$
$p_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-15)-1}{2*7}=\frac{14}{14}
=1
$
$p_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-15)+1}{2*7}=\frac{16}{14}
=1+1/7
$