Question

x ao quadrado-3x=4x+2

Answer 1

x²-3x = 4x+2
x²-3x-4x-2 = 0
x²-7x-2 = 0

A=1
B= -7
C= -2

Δ= B² - 4.A.C

Δ= (-7)² - 4.1.(-2)
Δ= 49 + 8
Δ= 57

X= -B±√Δ / 2.A

X= -(-7)±√57 /2

X1≅ 7+7,5/2
X1≅ 14,5/2
X1≅ 7,25

X2≅ 7-7,5/2
X2≅ -0,5/2
X2≅ -0,25