Answers

2014-08-27T21:11:41+05:30
5x² - 4 - 3x² + 6x + 8 + 5x - 13 = 
2x² - 9 + 11x
= 2 * (-2)² - 9 + 11 * - 2
= 2 * 4 - 9 - 22
= 8 - 9 - 22
= - 23
The answer is - 23
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2014-08-28T11:08:06+05:30
5x^2-4-3x^2+6x+8+5x-13
combine like terms
5x^2-3x^2+6x+5x-4-13+8
=2x^2+11x-9
substituing x=-2
=2(-2)^2+11(-2)-9
=8-22-9
=-23
hence the answer is -23
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