(2x-1) (2x + 1) (4x ^ 2-1), how to calculate, note that 4x ^ 2 is followed by minus

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• 1. 2X + (5-x) X4 = 14 2x + 20-4x = 14 why is 4x minus 2x? 4x is preceded by a minus sign, 4x-2x = 20-14 2x = 6 x = 3 2x+(5—x)x4=14 2X + 20-4x = 14? Why is 4x minus 2x? Why is 4x minus 2x 4x—2x=20—14 2x=6 x=3 I don't understand the question mark part Thank you
• 2. 1/(1*2)+1/(2*3)+1/(3*4)+... ...+1/(99*100)
• 3. Given 2a-6b + 8 = 36, find the value of 8a-24b-5
• 4. Let a and B satisfy a 2-8a + 6 = 0 and 6B 2-8b + 1 = 0, and find the value of AB + 1ab
• 5. The second power of a + the second power of B - the minimum of 8a-6b + 33
• 6. When a is more or less, the value of 13-8a is equal to 1 It's an inequality
• 7. When a = 1, 8A + 6 14
• 8. If a equals 5, find 8A plus 12
• 9. Find the maximum value g (a) of the function y = - cosx ^ 2 + acosx + 5 / 8a-1 / 2 (x is greater than or equal to 0, less than or equal to half)
• 10. Given that 0 ≤ A-B ≤ 1, 1 ≤ a + B ≤ 4, then when a-2b reaches the maximum, 8A + 2002b is equal to 0______ ．
• 11. (2x-1)(16x^4+8a^3+4x^2++2x+1)=
• 12. A ^ 2-10a + B ^ 2 + 6B + 34 = 0, what is the value of AB?
• 13. 8A cubic B square - 12ab flat cubic C
• 14. 8A cubic b-5a square B) / 4AB
• 15. Given a & # 178; + B & # 178; - 8A + 6B + 25 = 0, find a & # 178; - 4AB + 4B & # 178; divided into a & # 178; + ab-6b & # 178; We need to simplify the fraction first
• 16. Given a + B-8A + 6B + 25 = 0, find the solution of a + B of a-4ab + 4B
• 17. Given a + B-8A + 6B + 25 = 0, find the value of a + ab-6 of a-4ab + 4B
• 18. Given a + B-8A + 6B + 25 = 0, find the value of a + ab-6 of a-4ab + 4b, and the value of a + ab-6 of a + 4B How can elder martial brothers and sisters help My problem will be taught tomorrow!
• 19. What are the last two digits of 101 to the power of 2010 + 25 to the power of 2010? Please make it clear,
• 20. How to add the first power of 15 to the second power of 15 and the third power of 15 to the 100th power of 15