a. (x – 5)2= (- x + 5)2
(x – 5)2-(- x + 5)2=0
(x²-2x5+5²)-(-x²+2x5+5²)=0
x²-10x +25 -x²-10x-25=0
-20x=0
x = -20
b. (x3 + 8) : (x2– 2x + 4 ) = x + 2
x-2x²+4x³+8x²-16x+24
.....................
b2
a) x2(5x3– x – 6)
=5x²+³ -x³-6x²
b) ( x2 – 2xy + y2).(x – y)
=(x-1).(x-y)
=..............
3
a) y2 + 2y + 1
=(y²+2y)+1
y(y+2)+1
(y+1).(Y+2)
b) 9x2 + y2 – 6xy
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