Find a number k such that 4 and 1 are the solutions of x^2 - 5x + k = 0.
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Originally Posted by sologuitar Find a number k such that 4 and 1 are the solutions of x^2 - 5x + k = 0. sub in 4 or 1 for x and solve for k
Originally Posted by skeeter sub in 4 or 1 for x and solve for k I can't believe the problem is that easy.
It sure is! And I will confess that I would have suggested either 1) Use the quadratic formula: and set and and solve for k or 2) Write , multiply it out and solve for k. But skeeter's suggestion is far simpler than either of those.
Originally Posted by HallsofIvy It sure is! And I will confess that I would have suggested either 1) Use the quadratic formula: and set and and solve for k or 2) Write , multiply it out and solve for k. But skeeter's suggestion is far simpler than either of those. Thank you for the different methods.
The really nice thing is that all three methods give the same answer!