
Write the quadratic equation with roots p and q is
.
(Substitute
)
(Product of two same signs is positive)
Multiply the binomials using FOIL method
\
Multiply: 

(Multiply:
)
Apply multiplication property of equality: Multiply each side by 12.
\
(Cancel common terms)
(Apply zero product property:
)
(Multiply:
)
(Divide:
)
(Add: 9x + 4x = 13x)
The quadratic equation is
.