Answer:
4.6
Explanation:
Y needs to = 72. When x=5, Y = X3 - 6X Y = 53 - 6(5) Y = 125 - 30 = 95 95 > 72 95 is way too high so we try a lower number
When x=4 Y= X3 -6X Y = 43 - 6(4) Y = 64 - 24 Y = 40 40 < 72 40 is way too low so we try a higher number, 4.5
When x=4.5 Y = X3 - 6(4.5) Y = 4.53 - 6(4.5) Y = 64.125 64.125 < 72 64.125 is too low so we try a slightly higher number: 4.6
When x=4.6 Y = X3 - 6(X) Y = 4.63 - 6(4.6) Y = 97.336 - 27.6 Y = 69.736 69.736 < 72 69.736 is too low so we try a slightly higher number
When x=4.7 Y = X3 - 6(X) Y = 4.73 - 6(4.7) Y = 103.823 - 28.2 Y = 75.623 75.623 > 72 75.623 is too high so we should try a number in between 4.6 and 4.7
When x=4.65 Y = X3 - 6(X) Y = 4.653 - 6(4.65) Y = 100.54 - 27.9 Y = 72.64 72.64 > 72 72.64 is too high so to 1 decimal place, the solution to the equation is 4.6.