Explanation: (2x^2+8x)-(x^2-16)=0 You factor by splitting the middle term which gives you (x+4)^2=0 You then want to solve the single variable (x+4)^2 represents a product of 2 terms which is equal to zero and since all these terms are equal to each other the equation should be x+4=0 Subtract 4 from both sides, you get x = -4
Xn = ar^(n-1) n = term to find = 6 a = 1st term = 72 r = common ratio = 0.5 now we sub x6 = 72 * 0.5^(6-1) x6 = 72 * 0.5^5 x6 = 72 * 0.03125 x6 = 2.25 <===
