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(6x+10)x=21
We move all terms to the left:
(6x+10)x-(21)=0
We multiply parentheses
6x^2+10x-21=0
a = 6; b = 10; c = -21;
Δ = b2-4ac
Δ = 102-4·6·(-21)
Δ = 604
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{604}=\sqrt{4*151}=\sqrt{4}*\sqrt{151}=2\sqrt{151}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(10)-2\sqrt{151}}{2*6}=\frac{-10-2\sqrt{151}}{12} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(10)+2\sqrt{151}}{2*6}=\frac{-10+2\sqrt{151}}{12} $
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