A=3x-5y+4z , B=5x-4y+7z , C=3x-5y find 3a-4b+5c
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3a-4b+5c
= 3(3x-5y+4z)-4(5x-4y+7z)+5(3x-5y)
= 9x-15y+12z-20x+16y-28z+15x-25y
= 9x-20x+15x-15y+16y-25y+12z-28z
= 4x-24y-16z
priyanshu00087:
nice
Thanks....
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