Find the local maxima of f ( x ) = 2 x 3 − 30 x 2 + 126 x + 2

i know the answer is 3

step-by-step explanation:

thus, the first answer choice, y = sec x, is the correct one

"standard form:

3x2 + 14x − 10 = 0

solutions based on quadratic formula:

x1   = −14 − √ 142 − 4×3×(−10) /   2×3   = −14 − 2 × √ 79 /   6   ≈ −5.296

x2   = −14 + √ 142 − 4×3×(−10) /   2×3   = −14 + 2 × √ 79 /   6   ≈ 0.629

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step-by-step explanation: