Simplify:
(2x - 9) (4x + 1)
A. 8x² – 344-9
B. 8x2 + 34x – 9
C. 8x2 – 38x -9
D. 8x2 + 38x - 9

None of the above, the correct answer should be 8x² - 34x - 9

Step-by-step explanation:

Use FOIL, 2x*4x+2x-9x*4x-9

Calculate the product, 8x²+2x-9x*4x-9

Calculate the product, 8x²+2x-36x-9

Connect like terms, 8x²-34x-9

Final answer, 8x²-34x-9

69

step-by-step explanation:

"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