Question

simplify the expression and find the value if x= -4 "-(5x²+7x³-8/4) + (2x³+8x²+9/3)​

Answer 1

Answer:

Step-by-step explanation: n=

2

log

2

​

(5−x−3x

2

−7x

9

)

​

,

5−x−3x

2

−7x

9

​

>0 and 5−x−3x

2

−7x

9

≥0

Answer 2

$- (5x²+7x³- \frac{8}{4} ) + (2x³+8x²+ \frac{9}{3} )$

$= - 5( - 4)^{2} + 7( { - 4)}^{3} - 2 + 2( { - 4)}^{3} + 8( - 4) ^{2} + 3$

$= - 5(16) + 7(64) - 2 + 2( - 64) + 8(8) + 3$

$= - 80 + 448 - 2 - 18 + 7$

$= 355$