BU111 Lecture 1: Lab Report 1 Solutions.pdf
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BU111 Full Course Notes
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[6 marks] simplify each of the following expressions. (a) t4 ! 3)(t + 3)(t2 + 9) (t + 2)(t ! = 2(t + 3) = 2t + 6. [4 marks] an investor has a total of invested in two different accounts. The rst account pays 3% interest (i. e. if is invested in the rst account, then it earns sh:03x interest after one interest period) and the second account pays 5%. If, after one interest period, the interest earned in total is , state a linear equation in terms of one variable that represents the interest earned and nd the amount invested in each account. Let x represent the amount invested in the rst account. Then the amount invested into the second account is 1400 ! x: ) was invested in the rst account and 1400 ! Solve: !4x3 + 12x2 + 7x = 0.
