Which graph shows the solution set for -1.1x+6.4> -1.3? +
-10-9-8 -7 -6 -5 -4 -3 -2 -1 0
-10-9-8-7 -6 -5 -4 -3 -2 -1 0
0 1
2
3
4
5
6
7
8
9 10
+ + +
0 1 2 3
+
5
+
6 7
4
8
9 10

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

step-by-step explanation:

part a: 1.08

part b: 27.59