// Start of question: MultipleChoiceQ
(f+g)³ {
=f³+3f² g+3fg²+g³
~f³-3f² g-fg²+g³
~f³+f² g+fg²+g³
}
// Start of question: MultipleChoiceQ
(5x+4y)(-2x+y) {
~10x²-8xy+4y²
=-10x²-3xy+4y²
~-10x²+10xy+4yy
}
// Start of question: MultipleChoiceQ
25x4 {
~81y²(5x4+9y²)
~(5x4-9y²)
=(5x²-9y²)²(5x²+9y²)(5x²-9y²)
}
// Start of question: MultipleChoiceQ
p³+q³ {
=(p+q)(p² - pq +q²)
~(p-q)(p²+ pq +q²)
~(p-q)(p² - pq-q²)
}
// Start of question: MultipleChoiceQ
8x³-y³ {
~(x-y)(x²+ xy +y²)
=(2x-y)(4x²+ 2xy +y²)
~(8x³-y)(x³+ xy +y³)
}
// Start of question: MultipleChoiceQ
16xy²+2x² y+6x³ y³ {
~xy(1/8 y+x+3x² y²)
~2xy(1/8 y+2x+1/3 x² y²)
=2xy(8y+x+3x² y²)
}
// Start of question: MultipleChoiceQ
20-x-x² {
=(5+x)(4-x)
~(5-x)(4-x)
~(x+5)(x+4)
}
// Start of question: MultipleChoiceQ
x²+2xy+y² {
~(x-y)²
=(x+y)²
~(x+y)(x-y)
}
// Start of question: MultipleChoiceQ
x²-49y4 {
~(x-√7 y²)(x+√7 y²)
~(x+7y²)²
=x-7y²)(x+7y²)
}
// Start of question: MultipleChoiceQ
(a+b)(c+2d) {
=ac+2ad+bc+2bd
~ac+2ad+2bd
~abcd+2ad+bc+2bd
}