An auto shop charges a customer an equal amount for each new tire purchased plus an additional fee for an oil change. The function C (t) = 87t + 32
represents the total cost, C, of getting an oil change and purchasing t tires.

"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

your answer is 125y5