Mr. chan wants to sell some or all of his shares of stock in a company. he purchased 90 shares for $0.50 each last month, and the shares are now worth $3.80 each. if he sells half of his shares, how much of a profit will he earn? *

Mr Chan spent

dollars when he bought the shares. If he sells 45 shares at 3.80, he will gain

dollars. So, the net profit would be

"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