k² + 5x + 9x² =
= k² + 2 * k * 3х + (3x)²,
║ значит:
║ 2 * k * 3х = 5х,
║ k * 6х = 5х,
║ k = 5х / 6х,
║ k = 5/6,
k² + 2 * k * 3х + (3x)² =
= (5/6)² + 2 * 5/6 * 3х + (3х)² =
= 25/36 + 5х + 9х² =
= (5/6 + 3х)²
Объяснение:
