Using the ordering rules of BODMAS:
Brackets
Of
Division
Multiplication
Addition
Subtraction
= 4 x 2 + 1
= 8 + 1
= 9
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8x3 + 4x2 + 6x + 3 = 4x2(2x + 1) + 3(2x + 1) = (2x + 1)(4x2 + 3)
4x2 + 12x + 5 = (2x + 1)(2x + 5).
-((4x + 1)(x - 1))
4x2 + 12x + 5 = 4x2 + 2x + 10x + 5 = 2x(2x+1) + 5(2x+1) = (2x+1)(2x+5)
4x2 plus 3=11