Question

11 12 13 14 15 16 17 18 19 20 time remaining 01:26:14 fiona wrote out the description of each step for her multiplication of the binomial and trinomial (2x – 3)(5x2 – 2x + 7). In which step did fiona make an error? Step 1 step 2 step 3 step 4

Answer 1

 (2x - 3)(5x² - 2x + 7)

= 2x(5x² - 2x + 7)  -3(5x² - 2x + 7)       multiplied using distributive property

= 10x³ - 4x² + 14x   -15x² + 6x - 21        distributed 2x and -3

= 10x³ - 19x² + 20x - 21                         added like terms

You did not upload the image of the steps so I am not sure where fiona made the error.  Hopefully, you can figure it out from the information I provided.