a)\(x^2+7x+12\)
\(=x^2+x+6x+6\)
\(=x\left(x+1\right)+6\left(x+1\right)\)
\(=\left(x+1\right)\left(x+6\right)\)
a) x2 + 7x + 12 = x2 + 3x + 4x + 12
= (x2 + 3x) + (4x + 12)
= x(x + 3) + 4(x + 3)
= (x + 3)(x + 4)
vậy.....
ủa,sao mk chụp lên oy mà nó hk có ra j hết z nek
m.n giải câu a oy mk giải câu b thui nhen
=(a^10+a^9+a^8)-(a^9+a^8+a^7)+(a^7a^6+a^5)-(a^6+a^5+a^4)+(a^5+a^4+a^3)-(a^3+a^2+a)+(a^2+a+1)=(a^2+a+1)(a^8-a^7+a^5-a^4+a^3-a+1)
a. x2+7x+12
=(x2+3x)+(4x+12)
=x(x+3)+4(x+3)
=(x+4)(x+3)
b. a10+a5+1
=(a10+2a5+1)-a5
=(a5+1)2-\(\sqrt{a^5}^2\)
=(a5+\(\sqrt{a^5}\)+1)(a5-\(\sqrt{a^5}\)+1)
\(a,x^2+7x+12\)
\(=x^2+3x+4x+12\)
\(=x\left(x+3\right)+4\left(x+3\right)\)
\(=\left(x+3\right)\left(x+4\right)\)
