Question

Ex : 32
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Answer 1

32)

a)

3(x²-2x-3)-4(2x²-x-1)-5(-x²+x-1)=

3x²-6x-9-8x²+4x+4+5x²-5x+5=

(3x²-8x²+5x²)+(-6x+4x-5x)+(-9+4+5)=

-7x

b)

2x²-5x-2x(x-3)=

2x²-5x-2x²+6x=

(2x²-2x²)+(-5x+6x)=

x

c)

(2x-3)(6x+1)-4x(3x-5)=

12x²+2x-18x-3-12x²+20x=

(12x²-12x²)+(2x-18x+20x)-3=

4x-3

d)

3x²-2x-2(-x+3)+3(1-x²)=

3x²-2x-2(3-x)+3(1-x²)=

3x²-2x-6+2x+3-3x²=

(3x²-3x²)+(-2x+2x)+(-6+3)=

-3