Tìm x

b) (3x² + 10x - 8)² = (5x² - 2x + 10)²
d) 4x² + 4x+1=x²
f) (x² - 9)²-9(x - 3)² = 0
h)
(4x²-3x - 18)² = (4x² + 3x)²
j) (5x - 3)²-(4x - 7)² = 0
1) 4(2x + 7)² = 9(x + 3)²
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