Question

Oblicz:

a)(2x+1)kwadrat-(3x-1)(3x+1)-(2x-3)kwadrat

b)3(a-4)kwadrat-(5a-3)kwadrat+(3a-2)(2+3a)

c)-(2-x)kwadrat-8(1-x)kwadrat95(1+x)(1-x)

pilnee. z góry dziekuję :)

Answer 1

a) 4x2+4x+1-9x2-1-4x2+12x-9=-9x2+16x-9

b) 3(a2-8a+16)-25a2+30a-9+6a+9a2-4-6a=3a2-24a+48-25a2+30a-9+6a+9a2-4-6a=-13a2

+12a+35

 

 

Answer 2

A

 (2x+1)kwadrat-(3x-1)(3x+1)-(2x-3)kwadrat=

4 x2+4x+2-( 9 x2+3x-3x-1)-(4 x2-12x+9)=

4 x2+4x+2- 9 x2-3x+3x+1-4 x2+12x-9=

-9 x2 +16x-8

 

B

 3(a-4)kwadrat-(5a-3)kwadrat+(3a-2)(2+3a)=

3( a2-8a+16)-(25 a2-30a+9)+(6a+9 a2-4-6a)=

3 a2-24a+48-25 a2+30a-9+9 a2-4=

-13 a+6a+35

 

C

 -(2-x)kwadrat-8(1-x)kwadrat95(1+x)(1-x)=

-(4-4x+ x2)-8(1-2x+ x2)-95(1-x+x- x2)=

-4+4x- x2-8+16x-8 x2-95+95 x2=

86 x2+ 20x-107

 

Prosze bardzo,liczę na naj!!!!!!!!!