Question

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Matematică.
12. Efectuați calculele:
a) (x + 4)(x-3) - (x - 1)(x + 6);
c) (2x - 1)(x + 3) -2(x2 + x + 1);
e) (2x - 3)(3x - 2(x + 1)] + x(2x - 1).
b) (7x - 1)(x – 3) - 5(x + 2)(x + 4);
d) (x − 3)(2x – 3(x - 1)] + x(x + 5);
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Answer 1

Răspuns:

a) x²-3x+x-12-1(x²+6x-1x-6)

x²-2x-12-x²-6x+x+6

-2x-12-7x+6

-9x-6

b) 7x²-21x-x+3-5(x²+4x+2x+8)

7x²-22x+3-5x²-20x-40

2x²-42x-37

c) 2x²+6x-1x-3-2(x²+x+1)

2x²-5x-3-2x²-2x-2

-7x-5

la c cred ca ai scris ceva eronat (x2 ...am zis x²)

La restul faci la fel,arentie la semnul -