Question

Please help!! Brainliest given!

Answer 1

Answer:

Step-by-step explanation:

$2x^2+13x+15\\\\(2x+a)(x+b)=2x^2+(2b+a)x+ab=2x^2+13x+15\\\\a=3\\\\b=5\\\\\Rightarrow 2x^2+13x+15=(2x+3)(x+5)$

so it's option A

I think it's A, because the option for A is $(2^x+3)(x+5)$ and it should be $(2x+3)(x+5)$

2.

$(x+y+z)^2\\\\=(x+y+z)(x+y+z)\\\\=x(x+y+z)+y(x+y+z)+z(x+y+z)\\\\=(x^2+xy+xz)+(xy+y^2+yz)+(xz+yz+z^2)\\\\=(x^2+y^2+z^2)+(xy+xy)+(xz+xz)+(yz+yz)\\\\=x^2+y^2+z^2+2xy+2xz+2yz$

So it's option B