Question

Rút gọn biểu thức sau

M= (4x + 3 )² - 2x(x + 6) - 5(x -2)(x+2)

Answer 1

M=(4x+3)^2-2x(x+6)-5(x-2)(x+2)

=16x^2+24x+9-2x^2-12x-5(x^2+2x-2x-4)

=16x^2+24x+9-2x^2-12x-5x^2-10x+10x+20

=9x^2+12x+29

Answer 2

M = (4x + 3)² - 2x(x + 6) - 5(x - 2)(x + 2)

= 16x² + 24x + 9 - 2x² - 12x - 5(x² - 4)

= 14x² - 12x + 9 - 5x² + 20

= 9x² - 12x + 29

Answer 3

\(M=\left(4x+3\right)^2-2x\left(x+6\right)-5\left(x-2\right)\left(x+2\right)\)

\(M=\left(16x^2+24x+9\right)-2x^2-12x-5\left(x^2-4\right)\)

\(M=16x^2+24x+9-2x^2-12x-5x^2+20\)

\(M=9x^2-12x+29\)