I know all the anwers but it won't help you to give you al the answers, so I wil solve all of each type
8 and 9 are similar, so I will solve 9
10 is one
11 is last
I will solve 9,10,11
9.
convert into ax^2+bx+c=0 form
add 4x^2 to both sides
4x^2+5x+9=0
for
ax^2+bx+c=0
x=[tex] \frac{-b+/- \sqrt{b^2-4ac} }{2a} [/tex]
x=[tex] \frac{-5+/- \sqrt{5^2-4(4)(9)} }{2(4)} [/tex]
x=[tex] \frac{-5+/- \sqrt{25-144} }{8} [/tex]
x=[tex] \frac{-5+/- \sqrt{-119} }{8} [/tex]
no real soltuions, D
(number 8, would be x=[tex] \frac{-10+/- \sqrt{10^2-4(1)(-39)} }{2(1)} [/tex], simplify it yourself)
10. difference of 2 perfect squares, recognize it and do no work
(a-b)(a+b)=a²-b²
(3x-4)(3x+4)=(3x)²-(4)²=9x²-16
B
11.
to move an equation c units to the right, minus c from every x
that is what happend
minus 2
moved to the right 2 units
B is answer
8. simplify x=[tex] \frac{-10+/- \sqrt{10^2-4(1)(-39)} }{2(1)} [/tex] yourself to get answer
9. D
10. B
11. B
