Answer:16 secondsStep-by-step explanation:I used a really long way to find it. Not sure fi you want the steps, I don't even think I did this right. I used the Quadratic Formula and 16 was used so that's how got the answer. I did it another way too but got 5. I'm pretty sure 16 is correct though. Move all terms to the left side and set equal to zero. Then set each factor equal to zero.Exact Form:x=79Β±β1238532Decimal Form:x=5.94649734β¦,β1.00899734β¦f(x)=β16(x2β5xβ6)Since xis on the right side of the equation, switch the sides so it is on the left side of the equation.β16(x2β5xβ6)=f(x)Divide each term by β16and simplify.Tap for more steps...x2β5xβ6=βf(x)16Add βf(x)16to both sides of the equation.x2β5xβ6+f(x)16=0Multiply through by the least common denominator 16, then simplify.Tap for more steps...16x2β80xβ96+f(x)=0Use the quadratic formula to find the solutions.βbΒ±βb2β4(ac)2aSubstitute the values a=16, b=β80, and c=β96+f(x) into the quadratic formula and solve for x.80Β±β(β80)2β4β (16β (β96+f(x)))2β 16Simplify.Tap for more steps...x=10Β±β196βf(x)4