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(x-4) [9 (x-4) + 4] = 0
(x-4) (9x -36 +4) = 0
(x-4) (9x -32) = 0
x-4 = 0 ∨ 9x -32 = 0
x = 4 9x = 32 /:9
x =3 i 5/9
b) (3x-5)² = (8x+3)²
9x² -30x + 25 = 64x² + 48x + 9
-55x² -78x + 16 = 0 /·(-1)
55x² + 78x - 16 = 0
Δ = b²-4ac = 78² - 4·55·(-16) = 6084 + 3520 = 9604
√Δ = √9604 = 98
x₁ = (-78 - 98)/110 = -176/110 = - 88/55 = - 8/5 = - 1 i 3/5
x₂ = (-78 + 98)/110 = 20/110 = 2/11