f(x) = x⁴ - 5x + 70
f(8) = 8⁴ - 5(8) + 70
f(8) = ( 8² × 8² ) - 40 + 70
f(8) = ( 64 × 64 ) - 40 + 70
f(8) = 4.096 - 40 + 70
f(8) = 4.056 + 70
f(8) = 4.126
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f(x) = x⁴ - 5x + 70
f(8) = 8⁴ - 5(8) + 70
f(8) = ( 8² × 8² ) - 40 + 70
f(8) = ( 64 × 64 ) - 40 + 70
f(8) = 4.096 - 40 + 70
f(8) = 4.056 + 70
f(8) = 4.126
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