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9n+48=7n(n-2)
We move all terms to the left:
9n+48-(7n(n-2))=0
We calculate terms in parentheses: -(7n(n-2)), so:We get rid of parentheses
7n(n-2)
We multiply parentheses
7n^2-14n
Back to the equation:
-(7n^2-14n)
-7n^2+9n+14n+48=0
We add all the numbers together, and all the variables
-7n^2+23n+48=0
a = -7; b = 23; c = +48;
Δ = b2-4ac
Δ = 232-4·(-7)·48
Δ = 1873
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(23)-\sqrt{1873}}{2*-7}=\frac{-23-\sqrt{1873}}{-14} $$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(23)+\sqrt{1873}}{2*-7}=\frac{-23+\sqrt{1873}}{-14} $
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