Kurangkanlah. a.6a^2-5ab+4b^2 dari 6a^2-ab+3b^2 b. 5(p+q)

a. 4ab-b^2, b. -13p-21q, c. 4m-n-3, d. 6a^2-a-23

Pembahasan

a. (6a^2-ab+3b^2) - (6a^2-5ab+4b^2) = 6a^2-ab+3b^2 - 6a^2+5ab-4b^2 = 4ab-b^2
 b. -8(p+2q) - 5(p+q) = -8p-16q - 5p-5q = -13p-21q
 c. 3(2m-n+7) - 2(m-n+12) = 6m-3n+21 - 2m+2n-24 = 4m-n-3
 d. 4(3a^2-a-5) - 3(2a^2-a+1) = 12a^2-4a-20 - 6a^2+3a-3 = 6a^2-a-23