Question

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Answer 1

Răspuns:

Explicație pas cu pas:

4. x^2 +2xy +y^2 -12(x+y) =

(x+y)^2 -12(x+y) =

(-6)^2 -12(-6)

=36 + 72 =  108

5. ma = ((7-V3a)^2 + (7+V3a)^2)/2 =

(49 -14V3a +3a^2 +49 + 14V3a + 3a^2)/2 =

(98 + 6*a^2)/2 =

49 +3*a^2

Answer 2

Răspuns:

4.(x+y)²-12(x+y)=(6)²-12×(-6)=36+72=108

5.ma=( 49-2×rad3a×7+(rad3a)²+49+2×rad3a²+(rad3a)²):2=(9a+9a+98):2=9a+49

Explicație pas cu pas:

(a+b)²=a²+2ab+b²,(a-b)²=a²-2ab+b²

(rad a)²=puterea a 2 a se taie cu radicalul si a ul se aduce la puterea a 2 a