It’s 8.9 because in a simpler way 8 is greater than 7
A. square root property
it has one value with x which is x^2 and it cn be easily solved without having to factorise, quadratic formula cant be used as it need ax^2+bx+c=0 format
B. factorising
i just felt like this was easier to factorise than the other 2 options left
C. Completing the square
same reason personal preference
D- Quadratic
the 17 kinda threw me off and i didnt wanna get on factorising or doing completing the square so quadratic formal
Answer:
x=-8,y=-2
Step-by-step explanation:
x=2+5 y
put value of x in eq 2
9(2+5 y)+8=32 y
18+45 y+8=32 y
26=32 y-45 y
26=-13 y
y=26/-13
y=-2
put value of y in eq x=2+5 y
x=2+5(-2)
x=2-10=-8
Answer:
±sqrt( (vf) ^2 -2ad)) = vi
Step-by-step explanation:
(vf) ^2 = (vi)^2 +2ad
Subtract 2ad from each side
(vf) ^2 -2ad = (vi)^2 +2ad -2ad
(vf) ^2 -2ad = (vi)^2
Take the square root of each side
±sqrt((vf) ^2 -2ad)) = sqrt((vi)^2)
±sqrt( (vf) ^2 -2ad)) = vi
Answer: 134 I hope this helps
Step-by-step explanation: