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= 11x^2 -17x +24 -2x^2 -15x +18
= 9x^2 -32x + 42
2. 9a +12 -(7a +14)
= 9a +12 -7a -14
= 2a -2
atau 2(a -1)
11x² - 17x + 24 - 2x² - 15x + 18
11x² - 2x² -17x - 15x + 24 + 18
9x² - 32x + 42
selesai