Question

A) x² - 3x - 5= 2x + 9

B) 6x² - 5 (x-1) = x (x + 1) + 4

Answer 1

A)

x²-3x-5=2x+9

x²-5x-14

Δ= b²-4ac

Δ= (-5)² - 4 × 1 × (-14)

Δ=25+56

Δ = 81

x = (-b±√Δ)/2a

x = -(-5)±√81/2×1

x = 5±9/2

x' = 5+9/2 =7

x'' = 5-9/2 =-2