8. What is the sum of (5m2 - 7n2) and (8m2 - 6na? A. 13m? -n2 C. 3m2 - 1312 B. 13m2 + n2 D. 3m2 + 13n2 9. What must be added to (-2xyz + 4abc + 9) to obtain (3xyz - 6abc-42 A.Xyz + 2abc - 5 C. 5xyz + 10abc - 13 B. -xyz - 2abc - 5 D. 5xyz - 10abc - 13 10. If you combine the expressions (3x2 + 4x + 7), (x2 - 2x + 8) and (x2 - 5 - 6 what is the sum? A 7x2 - X-9 C. 8x2-X-9 B. 7x2 + x + 9 D. 882-X-9 11. What is the difference of 702) and (b)? A. -762 B. - 6b2 C. 60- D. 762 12. What is the difference of - 4xy) and (- 5xy)? A. - 9xy D. Oxy C.xy D.9xy 13. If (8m2 - 12n2) is subtracted from (8m2 - 9n-), what is the difference? A. -21 na B. 21 na C. 16m2 - 2in D. 16m? - 21n? 14. What would be the expression to be subtracted from abc + 6) to obtain - 10abc - 1)? A. 9abc - 5 B. -9abc + 5 C. 11abc7 D. -11abc -7 15. What is the difference if (3x2 + 4x +7) is subtracted from (432 - 53 - 6)? A. -X2 - 9x - 13 C. 8²-98- 13 B. -X2 + x + 13 D. x2 + x + 13
pa help po plaese i need this right now plaese po i brailist ko kayo
