Question

Me ajudem pfvr
e me falem a resposta

Answer 1

Δ = b² -4ac

0 = a² + ( -4 ). ( 4 ) . ( 9 )

0 = a² - 144

a² = 144

a = 12

Answer 2

Vamos lá

4x² + ax + 9 = 0

(2x - 3)² = 0

x = 3/2

9 + 3a/2 + 9 = 0

3a/2 = -18

3a = -36

a = -12

4x² - 12x + 9 = 0