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= 10x + 25 - 4x² - 10x
= -4x² + 25
8) (2x + 3y) (ax +by) = cx² + 23xy + 12y²
2ax² + 2bxy + 3axy + 3by² = cx² + 23xy + 12y²
* 2a = c
* 2b+3a = 23
* 3b = 12 --> b =4
maka 2(4) + 3a = 23 --> a =5
2(5) = c --> c=10
9) 2x² + 3x - 4 : (x +3)
(pakai cara biasa)
dapat hasilnya 2x-3 sisa 5
14) c
hehe semoga bermanfaat