Asked by monkie
twenty times the square of a non-zero number is equal to 15 times the number. what is the number?
Answers
Answered by
Reiny
20x^2 = 15x
20x^2 - 15x = 0
5x(4x-3) = 0
so x=0 or x=3/4, but x wan non-zero so
x = 3/4
check:
20(9/16) = 45/4
15(3/4) = 45/4 , yup!
20x^2 - 15x = 0
5x(4x-3) = 0
so x=0 or x=3/4, but x wan non-zero so
x = 3/4
check:
20(9/16) = 45/4
15(3/4) = 45/4 , yup!
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