The product 18
The product of two consecutive natural numbers which are multiples of 3 is equal to 810. Find the two numbers.
Correct answer:
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Dr. Math
3x(3x + 3) = 810
9x² + 9x - 810 = 0
x² + x - 90 = 0
(x + 10)(x - 9) = 0
x = -10 or x = 9
-10 is not natural no
x = 9
3x = 27, 3x + 3 = 30
Ans : 27 & 30
9x² + 9x - 810 = 0
x² + x - 90 = 0
(x + 10)(x - 9) = 0
x = -10 or x = 9
-10 is not natural no
x = 9
3x = 27, 3x + 3 = 30
Ans : 27 & 30
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