Write the expression 5x2 – 4 – 3x2 + 6x + 8 + 5x – 13 in its s

1.	Write the expression 5x2 – 4 – 3x2 + 6x + 8 + 5x – 13 in its simplified form. Find its value when x = -2
Answer» The given algebraic expression = 5x² – 4 – 3x² + 6x + 8 + 5x – 13. = (5x² – 3x²) (6x + 5x) + (-4 – 13) = 2x² + 11x – 17 When x = – 2. then the value of 2x²+ 11x – 17 = 2(- 2)² + 11(-2) – 17 = 2 × 4 – 22 – 17 = 8 – 39 = – 31

Write the expression 5x2 – 4 – 3x2 + 6x + 8 + 5x – 13 in its simplified form. Find its value when x = -2

Answer»

The given algebraic expression

= 5x² – 4 – 3x² + 6x + 8 + 5x – 13.

= (5x² – 3x²) (6x + 5x) + (-4 – 13)

= 2x² + 11x – 17

When x = – 2. then the value of 2x²+ 11x – 17

= 2(- 2)² + 11(-2) – 17

= 2 × 4 – 22 – 17

= 8 – 39

= – 31