Question

por favor, es urgente​

Answer 1

Respuesta:

Pregunta 7

$a = \frac{b \times h}{2} \\ a = \frac{(8{x}^{2} - 7x + 1) \times (4 {x}^{2} + 6x) }{2} \\ a = \frac{32 {x}^{4} + 48 {x}^{3} - 28 {x}^{3} - 42 {x}^{2} + 4 {x}^{2} + 6x}{2} \\ a = \frac{32 {x}^{4} + 20 {x}^{3} - 38 {x}^{2} + 6x}{2} \\ a = \frac{2(16 {x}^{4} + 10 {x}^{3} - 19 {x}^{2} + 3x) }{2} \\ a = 16 {x}^{4} + 10 {x}^{3} - 19 {x}^{2} + 3x$

Pregunta 8

$a = \frac{((6 {x}^{2} + 7x - 5) + (4 {x}^{2} + 5x + 1)) \times (8x + 6) }{2} \\ a = \frac{(10 {x}^{2} + 12x - 4) \times (8x + 6)}{2} \\ a = \frac{80 {x}^{3} + 96 {x}^{2} - 32x + 60 {x}^{2} + 72x - 24 }{2} \\ a = \frac{80 {x}^{3} + 156 {x}^{2} + 40x - 24 }{2} \\ a = \frac{2(40 {x}^{3} +78 {x}^{2} + 20x - 12)}{2} \\ a = 40 {x}^{3} +78 {x}^{2} + 20x - 12$