find two consecutive odd integers whose product is 1 less than 6 times their sum. Domain for the smallest : {-1, 1, 11}
1 answer:
Let x be the 1st odd number, and x+2 the second odd consecutive number: (x)(x + 2) = 6[((x) + (x+2)] -1 x² + 2x = 6(2x + 2) - 1 x² + 2x = 12x +12 - 1 And x² - 10x - 11=0 Solve this quadratic expression: x' = [+10 +√(10²- 4.(1)(-11)]/2 and x" = [+10 -√(10²- 4.(1)(-11)]/2 x' = [10 + √144]/2 and x" = [10 - √64]/2 x' = (10+12)/2 and x" = (10-12)/2 x = 11 and x = -1 We have 2 solutions that satisfy the problem: 1st for x = 11, the numbers at 11 and 13 2nd for x = - 1 , the numbers are -1 and +1 If you plug each one in the original equation :(x)(x + 2) = 6[((x) + (x+2)] -1 you will find that both generates an equlity
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