21. 6ab-b2 +12ac-2bc
24. (ax + by)² + (bx - ay)?
27. ab(x2 + y²) - xy(a + b
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21) (6ab-b^2)+(12ac-2bc) =b(6a-b)+2c(6a-b) =(6a-b)(b+2c)
24) a2x2 + b2y2 + 2abxy + b2x
a2x2 + b2y2 + b2x2 + a2y2
a2x2 + a2y2 + b2x2 + b2y2
a2 ( x2 + y2 ) + b ( x2 + y2 )
( a2 + b2 ) ( x2 + y2 )
27) abx2 + aby2 - a2xy + b2xy
= abx2 - a2xy - b2xy + aby2
= ax ( bx - ay) - by ( bx - ay)
= ( bx - ay) ( ax - by)
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