If you expand out the brackets you get this,
(4+5i)(a+2i) = 4a + (5a)i + 8i - 10
The -10 comes from 5i * 2i.
Squaring i becomes -1.
Let's group the real stuff together,
and imaginary separately,
(4a - 10) + (5a + 8)i
For this to be purely imaginary,
the real part needs to be zero.
Therefore 4a - 10 = 0
Solve for a.
X = el entero más pequeño
Entonces, el otro entero = x+1
Y podemos poner estos numeros en la equacion dado:
x + x+ 1 = 25
2x + 1 = 25
2x = 24
x = 12
x+ 1 = 13
Entonces, los enteros son 12 & 13.
Answer:
a) (2,4)
Step-by-step explanation:
it's where the points meet
The frist one is correct for it
