Answer:
x ≈ - 6.74, 0.74
Step-by-step explanation:
x² + 6x - 5 = 0 ( add 5 to both sides )
x² + 6x = 5
To complete the square
add ( half the coefficient of the x- term )² to both sides
x² + 2(3)x + 9 = 5 + 9
(x + 3)² = 14 ( take square root of both sides )
x + 3 = ± ( subtract 3 from both sides )
x = - 3 ±
Then
x = - 3 - ≈ - 6.74 ( to the nearest hundredth )
x = - 3 + ≈ 0.74 ( to the nearest hundredth )
the answer is 9
..............
2x+2 + 5x+3 = 180
7x+5 = 180
7x = 175
x = 175/7 = 25
x = 25
-15x + 39 = -3(5x - 13)
a. -3(5x - 13) = -15x + 39
b. -3(5x + 13) = -15x - 39
c. 3(5x - 13) = 15x - 39
d. 3(5x + 13) = 15x + 39