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(2x +3y) (px +qy) = rx² +23xy +12y²
2px² +2qxy +3pxy +3qy² = rx² +23xy +12y²
r = 2p
2p +3q = 23
3q = 12
q = 4
2p +3q = 23
2 (4) +3p = 23
8 +3p = 23
3p = 15
p = 5
r = 2p
r = 2 (5)
r = 10
Jadi, nilai r pada persamaan bentuk Aljabar tersebut adalah C. 10.
no 7.
ab÷1/a= ab×a=a^2b
a^2b÷b=a^2.
jwbnnya c. a^2.
no 8.
2/a÷3/2a=2/a×2a/3=4/3.
no 9.
kurang jelas soalnya tp jwbnnya c.
no 10.
(x-2y)(x-2y)
x^2-4xy+4y^2
c.
no 11.
9x^2-2x/y+1/9y^2
d.