Q. (y−k)y=31In the given equation, k is a constant. One of the solutions to the equation is:23+9+4(31)What is the value of k ?
Given equation and solution: We are given the equation (y−k)y=31 and a solution y=23+9+4(31). To find the value of k, we will substitute the given solution into the original equation and solve for k.
Substituting the solution: First, let's substitute y=23+9+4(31) into the equation (y−k)y=31. (23+9+4(31)−k)⋅23+9+4(31)=31
Simplifying the square root term: Now, let's simplify the square root term in the solution. We have 9+4(31)=9+34=9+1.3333=10.3333
Substituting the simplified square root: Substitute the simplified square root back into the equation: (23+10.3333−k)⋅23+10.3333=31(23+10.3333)2−k⋅23+10.3333=31
Squaring the solution: Now, let's square the solution y to prepare for substitution: (23+10.3333)2=49+3⋅10.3333+3⋅10.3333+10.3333=419.3333+6⋅10.3333
Substituting y2 back into the equation: Substitute y2 back into the equation:419.3333+6⋅10.3333−k⋅23+10.3333=31
Clearing the fraction: Multiply both sides of the equation by 3 to clear the fraction: 3×(419.3333+610.3333−k⋅23+10.3333)=1
Simplifying the left side: Simplify the left side of the equation:(419.3333+610.3333×3−3k⋅23+10.3333)=1
Distributing the 3: Now, let's distribute the 3 on the left side of the equation:458+1810.3333−29k+3k10.3333=1
Having a common denominator: To simplify further, we need to have a common denominator for the terms on the left side. The common denominator is 4, so we multiply the second term by 22 to get the same denominator:458+1810.3333−418k+6k10.3333=1
Combining like terms: Combine like terms on the left side:(458+1810.3333−18k−6k10.3333)=1
Clearing the denominator: Multiply both sides by 4 to clear the denominator: 58+1810.3333−18k−6k10.3333=4
Isolating k: Rearrange the terms to isolate k: 18k+6k10.3333=58+1810.3333−4
Simplifying the right side: Simplify the right side: 18k+6k10.3333=54+1810.3333
Factoring out k: Factor out k on the left side:k(18+610.3333)=54+1810.3333
Dividing both sides by (18+610.3333): Divide both sides by (18+610.3333) to solve for k:k=18+610.333354+1810.3333
Simplifying the right side: Simplify the right side by dividing both the numerator and the denominator by 6:k=6(3+10.3333)6(9+310.3333)k=3+10.33339+310.3333
Solve for the value of k:k=3+10.33333(3+10.3333)k=3
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