Question

x² + x - 20=12
x² + x x² + x - 20=12 x² + x - 20=12=12​

Answer 1

${x}^{2} + x - 20 \\ {x}^{2} + 5x - 4x - 20 \\ x(x + 5) - 4(x + 5) \\ (x + 5)(x - 4)$