(A-7)(a+9)=(a-3)(a-7)

Solution for (A-7)(a+9)=(a-3)(a-7) equation:

(-7)(A+9)=(A-3)(A-7)

We move all terms to the left:

(-7)(A+9)-((A-3)(A-7))=0

We multiply parentheses ..

(-7A-63)-((A-3)(A-7))=0


We calculate terms in parentheses: -((A-3)(A-7)), so:

(A-3)(A-7)

We multiply parentheses ..

(+A^2-7A-3A+21)

We get rid of parentheses

A^2-7A-3A+21

We add all the numbers together, and all the variables

A^2-10A+21

Back to the equation:

-(A^2-10A+21)


We get rid of parentheses

-A^2-7A+10A-63-21=0

We add all the numbers together, and all the variables

-1A^2+3A-84=0

a = -1; b = 3; c = -84;
Δ = b2-4ac
Δ = 32-4·(-1)·(-84)
Δ = -327
Delta is less than zero, so there is no solution for the equation