bjr
ex 6
A = 5 (3x - 2) = 5*3x + 5*(-2) = 15x - 10
B = (x+3) (x-7) = x*x + x*(-7) + 3*x + 3*(-7) = x² - 7x + 3x - 21 = x² - 4x - 21
C = 5 (3x-2) - (x+3) (x-7)
si x = 2
C = 5 (3*2 - 2) - (2 + 3) (2 - 7) = 5*4 - 5*(-5) = 20 + 25 = 45
C = 15x - 10 - (x² - 4x - 21) = 15x - 10 - x² + 4x + 21 = -x² + 19x + 11
C = -2² + 19*2 + 11 = - 4 + 38 + 11 = 45
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bjr
ex 6
A = 5 (3x - 2) = 5*3x + 5*(-2) = 15x - 10
B = (x+3) (x-7) = x*x + x*(-7) + 3*x + 3*(-7) = x² - 7x + 3x - 21 = x² - 4x - 21
C = 5 (3x-2) - (x+3) (x-7)
si x = 2
C = 5 (3*2 - 2) - (2 + 3) (2 - 7) = 5*4 - 5*(-5) = 20 + 25 = 45
C = 15x - 10 - (x² - 4x - 21) = 15x - 10 - x² + 4x + 21 = -x² + 19x + 11
si x = 2
C = -2² + 19*2 + 11 = - 4 + 38 + 11 = 45