Question

1.Hasil dari (3-2x)(4x-5) adalah...

2.Hasil (3-a)(3a+4)(a- 5)=...

3. Hasil ((2r-7s)-(8s-r))(r-2s)=...

4. Hasil pengurangan (x-2y)(x+2y) oleh -2x² + 3xy + y2 adalah...

5. Hasil (2x-1)³ adalah...

6. Bentuk sederhana 5q-5p²q+ 2pq²-2q-3pq² +q adalah...

7.Jika a= 2y+3ײ-xy dan b= x²+ 2xy- 3y, hasil dari 3a-2b=....

Answer 1

1. (3-2x )(4x-5)
= 12x-15-8x+10x
=14x-15
2. (3-a)(3a+4)
=9a+12-3a^2-4a
=-3a^2-5a+12
=(3a^2-5a+12)(a-5)
=3a^3-15a^2-5a^2-25a+12a-60
=3a^3-20a^2-13a-60
3. (2r-7s)-(8s-r)
= 3r-15s
= (3r-15s)(r-2s)
=3r^2-6rs-15rs+30s^2
=3r^2+30s^2-21rs
4. (x-2y)(x+2y)
= x^2+2xy-2xy-4y^2
=x^2-4y^2
=(x^2-4y^2) - (
5. (2x-1)(2x-1)(2x-1)
=4x^2-2x-2x+1 (2x-1)
=(4x^2-4x+1)(2x-1)
=8x^3-4x^2-8x^2-4x+2x-1
=8x^3-12x^2-2x-1
6. 5q-5p²q+ 2pq²-2q-3pq² +q
= -5p^2q+2pq^2-3pq^2+5q-2q+q
=-5p^2q-pq^2+4q
7. 3(2y+3ײ-xy) - 2(x²+ 2xy- 3y)
=(6y+9x^2-3xy) - (2x^2+4xy-6y)
=9x^2-2x^2+6y+6y-3xy-4xy
=7x^2+12y-7xy

itu no 4 gak jelas jd gak aku kerjain

Answer 2

4. Kalikan (x-2y)(x+2y)
= (x^2-4y^2)-(-2x^2 + 3xy+y^2)
= x^2 -4y^2 + 2x^2 -3xy-y^2 (satukan sejenis)
=x^2 + 2x^2 - 4y^2 -y^2 -3xy
= 3x^2 -3xy -5y^2




smoga tidak keliru y, mohon ditelaah kembali.