Question

Write the expression 5xsqaure -4-3xsqaure +6x+8+5x-13 in its simplified form find its value when x=-2

Answer 1

Answer :

5x^2 - 4 - 3x^2 + 6 X + 8 + 5 x - 13

5(- 2 )^2- 4 - 3 (- 2 )^2+ 6 ×(- 2 )+ 8 + 5×(- 2)-13

5×4-4-3×4+6×(-2)+8(-10)-13

20 - 4 -12 +(-12)+ 8 +(-10) -13

16 -12 +(-12) +8 +(-10)-13

4 + (-12) +8 +(-10)-13

-8 +8 +(-10) -13

0 +(-10) -13

-23