Please help ! I’m so confused

part A step 2 is wrong

part B  equals  52

Step-by-step explanation: because in Part A Fernando should have in step two he multiplied in 4^2  first. and part b equals 52 because if you use PEMDAS correctly you should have add 6+4 first then 8^2 which equals  64 and then you have left 64-4x3 since in PEMDAS you first 4x3 which is 12 and 64-12 is 52 so I hope this helped :)

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step-by-step explanation:

answer is 8x+24

area of vanessa's patio = length × width

given, length = (3x² + 5x + 10)

width = (x² - 3x - 1)

area of vanessa's patio = (3x² + 5x + 10)(x² - 3x - 1)

= 3x²(x² - 3x - 1) + 5x(x² - 3x - 1) + 10(x² - 3x - 1)

= 3x⁴ - 9x³ - 3x² + 5x³ - 15x² - 5x + 10x² - 30x - 10

= 3x⁴ - 4x³ - 8x² - 35x - 10

hence, expression of vanessa's patio = (3x⁴ - 4x³ - 8x² - 35x - 10)