Practice problem
Which of the following is not a step in foiling (4x+2)(5x−1)(4x + 2)(5x - 1)(4x+2)(5x−1)?
(4x)(5x)+(2)(5x)+(4x)(−1)+(2)(−1)(4x)(5x) + (2)(5x) + (4x)(-1) + (2)(-1)(4x)(5x)+(2)(5x)+(4x)(−1)+(2)(−1)
(4x)(2)+(5x)(2)+(5x)(−1)+(4x)(−1)(4x)(2) + (5x)(2) + (5x)(-1) + (4x)(-1)(4x)(2)+(5x)(2)+(5x)(−1)+(4x)(−1)
20x2+10x−4x−220x^2 + 10x - 4x - 220x2+10x−4x−2
20x2+6x−220x^2 + 6x - 220x2+6x−2
Type a concept, like “slope” or “photosynthesis”.
