Quadratics and Cubics, SMB-044 Solve for `a` given `8a^3+21=0.` Round your answer to two decimal places. (2 marks) --- 4 WORK AREA LINES (style=lined) --- Show Answers Only `a=-1.38` Show Worked Solution `8a^3+21` `=0` `8a^3` `=-21` `a^3` `=-21/8` `a` `=-root3(21/8)` `=-1.379…` `= -1.38`