Вправи: 538

538. Розкладіть на множники тричлен:

1) x² + 4x + 3 = x² + x + 3x + 3 = x(x + 1) + 3(x + 1) = (x + 1)(x + 3);

2) x² – 10x + 16 = x² – 2x – 8x + 16 = x(x – 2) – 8(x – 2) = (x – 2)(x – 8);

3) x² + 3x – 18 = x² – 3x + 6x – 18 = x(x – 3) + 6(x –3) = (x – 3)(x + 6);

4) x² – 4x – 32 = x² + 4x – 8x – 32 = x(x + 4) – 8(x + 4) = (x + 4)(x – 8).