find y when x = 5

585

Step-by-step explanation:

y = 5x³ - 8x     Let x = 5

  = 5(5)³ - 8 × 5

  = 5 × 125 – 40

  = 625 – 40

  = 585

For this case, we have an equation of the form, where , we must replace in the following equation:

Solving the power:

problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

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