x^2 + 8x = -3
x^2 + 8x + 16 = -3 + 16
using a^2 + 2 a b + b^2 = (a+b)^2

x^2 + 8x + 16 = 13

(x +4)^2 = 13

answer : 16 is the number you must add to complete the square

5 0

3 years ago

If the sin 60° is square root 3 over 2, then the cos ____° = _____.

Grace [21]

The cos 30 degrees; square root 3 over 2

6 0

4 years ago

John had 30 sneakers, with 18 of the black. What is the ratio of the sneakers that are not black

balu736 [363]

Answer:

18:12

Step-by-step explanation:

30-18=12

18:12

7 0

3 years ago

Triangle ABC has vertices A (0, 2), B (5, 4), and C (5, 0). Triangle A′B′C′ has corresponding vertices A′ (–5, –1), B′ (0, 1), a

bija089 [108]

Answer:

Step-by-step explanation:

5 0

3 years ago