Practice mode / Equations and Inequalities (a10-c2)2 – (a10+c2)2 =? A Option A: a20+c4 B Option B: 0 C Option C: a10+c2 D Option D: ?4a10c2 E Option E: 2a20+c4 Correct answer D. ?4a10c2 Show answer Report a problem How we write and check questions
Question 01 / Equations and Inequalities (x+4)(x-5) = 10 then x is? A Option A: 6 B Option B: -5 C Option C: both D Option D: none Correct answer C. both Show answer Open question
Question 02 / Equations and Inequalities 21d2 – 7d + 8 – 4d (2d-3) =? A Option A: 14d2+8 B Option B: 13d2+5d-8 C Option C: 8d-8 D Option D: 13d2+5d+8 Correct answer D. 13d2+5d+8 Show answer Open question
Question 03 / Equations and Inequalities If n = 4 and m = 7 then 1/n + 1/nm? A Option A: 1?14 B Option B: 2?7 C Option C: 3?7 D Option D: 4?15 Correct answer B. 2?7 Show answer Open question
Question 04 / Equations and Inequalities If a? -b (a2-b2)/(a-b) = 40 then a+b =? A Option A: 20 B Option B: 60 C Option C: 400 D Option D: 40 E Option E: none Correct answer D. 40 Show answer Open question
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