Question

Help me please!!

Answer 1

irst factor out the 2 to get:
⟹2(x2+7xy−18y2)=2(x+By)(x−2y)
Dividng both sides by 2 yields:
⟹x2+7xy−18y2=(x+By)(x−2y)
Now expand the right hand side (expand the factored equation):
⟹x2+7xy−18y2=x2−2xy+Bxy−2By2
Now let's factor out the 'xy' from the second and third terms:
⟹x2+7xy−18y2=x2+(B−2)xy−2By2
Now let's compare coefficients; We know that that the right and left quadratics are both identical hence the coefficient of xy must be the same in both. This then implies:
B−2=7⟹B=9
Similarly, you could also compare the coefficients of y2 in both quadratic which also yields the same answer:
2B=18⟹B=9

Answer 2

b=9

Answer 3

@iGreen , @Michele_Laino

Answer 4

So ya its 9

Answer 5

Thanks guys!

Answer 6

Yw