Question

calculati valoarea expresiei 4(2x + 3y + z) - 3(3x - y + 5z) + 2(2x - 4y - z) pentru:

a) x=-8 ; y=-6 ; z=-9
b)x=11 ; y=-12 ; z=13
c)x=-15 ; y=+12; z=10

Answer 1

4(2x+3y+z)-3(3x-y+5z)+2(2x-4y-z)=8x+12y+4z -9x+3y-15z+4x-8y-2z=3x+7y-13z

a)3•8+7•6-13•(-9)=183

b)3•11+7•(-12)-13•13=-220

c)3•(-15)+7•12-13•10=-91

Answer 2

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