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= 2x² - 4x² + 7 + 8
= -2x² + 15
2. ( 4a² + 3a ) - ( 5a² + 4a ) = 4a² + 3a - 5a² - 4a
= 4a² - 5a² + 3a - 4a
= -a² - a
2x²- 4x² + 7 + 8
kenapa -(4x²-8) menjadi
-4x² + 8 ? karena
-(4x²-8)= -1(4x² - 8)
(-) dikalikan (+) hasil nya (-)
(-) dikalikan (-) hasilnya (+)
selamat mengerjakan :)