(3m-1)(m+2)-(m+3)(2m-1) при m=0.5 (x-2)(3x+1)+(3x-1)(x+2) При x= -0.5

Question

(3m-1)(m+2)-(m+3)(2m-1) при m=0.5 (x-2)(3x+1)+(3x-1)(x+2) При x= -0.5

Answer 1

(3m-1)(m+2)-(m+3)(2m-1) = 3m²+6m-m-2-2m²+m-6m+3= m²+1

m = 0.5

(0.5)² + 1 = 0.25 + 1 = 1.25

(x-2)(3x+1)+(3x-1)(x+2) = 3x²-6x+x-2+3x²+6x-x-2 = 6x²-4

x= -0.5

6*(-0.5)² - 4 = 6 * 0.25 - 4 = 1.5 - 4 = -2.5