Question

Efectuați
a)
$(x + 1) {}^{2}$
b)
$(1 + x) {}^{2}$
c)
$(x - 1) {}^{2}$
d)
$(1 - x) {}^{2}$
e)
$( - y + 5) {}^{2}$
f)
$( - b {}^{3} + 5) {}^{2}$
g)
$(x + 5)(x - 5)$
e)
$(a + \sqrt{7} )(a - \sqrt{7} )$
vă rog mult ajutați
!!!!:(
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Answer 1

a) (x+1)^2 = x^2 + 2x * 1^2 = x^2 + 2x + 1

b) (1+x)^2 = 1^2 + 2 * 1x + x^2 = 1 + 2x + x^2

c) (x-1)^2 = x^2 - 2x * 1 + 1^2 = x^2 - 2x + 1

d) (1-x)^2 = 1^2 - 2 * 1x + x^2 = 1 - 2x + x^2

e) (-y+5)^2 = (5-y)^2 = 5^2 - 2 * 5y + y^2 = 25 - 10y + y^2

f) (-b^3+5)^2 = (5-b^3)^2 = 5^2 - 2 * 5b^3 + (b^3)^2 = 25 - 10b^3 + b^6

g) (x+5)(x-5) = x^2 - 5^2 = x^2 - 25

e) (a+ √7)(a-√7) = a^2 - √7^2 = a^2 - 7

Sper ca te am ajutat!!

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