Respuesta :
Answer: -12 x 4
Step-by-step explanation:
12 times 4 is 48
Rule: A negative multiplied by a positive, will always give you a negative.
So, -12 is a negative number and 4 is a positive number.
Negative x Positive = Negative
Positive x Negative = Negative
-12 x 4 = -48
Answer:
2 - [tex]\sqrt{52}[/tex] and 2 + [tex]\sqrt{52}[/tex]
Step-by-step explanation:
let the 2 numbers be x and y , then
x + y = 4 ( subtract x from both sides )
y = 4 - x → (1)
xy = - 48 → (2)
substitute y = 4 - x into (2)
x(4 - x) = - 48
4x - x² = - 48 ( multiply through by - 1 )
x² - 4x = 48
solve using the method of completing the square
add ( half the coefficient of the x- term )² to both sides
x² + 2(- 2) x + (- 2)² = 48 + (- 2)²
(x - 2)² = 48 + 4 = 52 ( take square root of both sides )
x - 2 = ± [tex]\sqrt{52}[/tex] ( add 2 to both sides )
x = 2 ± [tex]\sqrt{52}[/tex]
substitute this value into (1)
y = 4 - (2 ± [tex]\sqrt{52}[/tex] ) = 4 - 2 ± [tex]\sqrt{52}[/tex] = 2 ± [tex]\sqrt{52}[/tex]
then the 2 numbers are
2 - [tex]\sqrt{52}[/tex] and 2 + [tex]\sqrt{52}[/tex]