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A+B=4x²
A-B=10
ukła równań z tego:
A=4x²-B
4x²-B-B=10
4x²-2B=10
-2B=10-4x² / :-2
B=10-4x²/-2 = 5-2x²
A-B=10
A-10-4x²/-2=10
A=10+10+4x²/2 = 20+4x²/2 = 10+2x²
A = 10+2x²
B = 5-2x²
ZADANIE 2
a)
A+(7x²+2x²-4)=10x²+10x
A=10x²+10x-(7x²+2x²-4)
A=10x²+10x-7x²-2x²+4
A=x²+10x+4
b)
A-(-5x²-6x+3)=x²+x+1
A=x²+x+1-5x²-6x+3
A=-4x²-5x+4
c)
(3x²+6x-1)-A=2x²+x
-A=2x²+x-(3x²+6x-1)
-A=2x²+x-3x²-6x+1 / *(-1)
A=-2x²-x+3x²+6x-1
A=5x²+5x-1
d)
3x²-A=A-5x²
-A=A-5x²-3x²
-2A=-8x² / :-2
A=4x²