Question

50 БАЛІВ!!! СРОЧНО..........................

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Answer 1

1. а) x²-13x+40

x²-5x-8x+40

x×(x-5)-8(x-5)

(x-5)×(x-8)

b)6x²+x-1

6x²+3x-2x-1

3x×(2x+1)-(2x+1)

(2x+1)×(3x-1)

2.

a)x²-18x+17

x²-x-17x-17

x×(x-1)-17(x-1)

(x-1)×(x-17)

b)-x²-4x+21

-x²+3x-7x+21

-x×(x-3)-7(x-3)

-(x-3)×(x+7)

b)4x²-15x+9

4x²-3x-12x+9

x×(4x-3)-3(4x-3)

(4x-3)×(x-3)

3. x²+3x-4/x+4

x²+4x-x-4/x+4

(x+4)×(x-1)/x+4

x-1

3x-9/x²+4x-21

3(x-3)/(x+7)×(x-3)

3/x+7

4.

x⁴-17x²+16=0

(x²)²-17x²+16=0

t²-17t+16=0

t²-t-16t+16=0

(t-1)×(t-16)=0

t-1=0

t-16=0

t=1

t=16

x²=1

x²=16

x=1

x=-1

x=-4

x=4