Answer:
Step-by-step explanation:
Answer:
the answer is a
you can subsitute or work backwards
Answer:
A) -2 - i√3 , -2 + i√3
Step-by-step explanation:
Solve using quadratic formula
x² + 4x + 7 = 0
The Almighty Formula
= -b ± √b² - 4ac/2a
Where ax + bx² + c = 0
From the above question
a = 1, b = 4, c= 7
Hence,
-4 ± √4² - 4 × 1 × 7/2 × 1
-4 ± √16 - 28/2
=( -4 ± √-12)/2
Since
b² - 4ac < 0
We have two complex roots
Simplifying
( -4 ± √-12)/2
= -4/2 ± √-12/2
= -2 ± 2√3i/2
= -2 ± √3i
Therefore,
-2 - √3i , -2 + √3i
or
-2 - i√3 , -2 + i√3
Option A , is the correct answer
The Muslim mathematicians adopted a numerical system from India. The correct answer is B.
Answer:
y=2x-6
Step-by-step explanation:
y+4=2(x-1)
Subtract 4 to both sides of the equation:
y+4-4=2(x-1)-4
y=2(x-1)-4
Distribute the 2:
y=2x-2-4
y=2x-6
Where 2 is the slope and -6 is the y - intercept.
