I need help with the question 30 only

[prime path]

let the perfect square be (u + x)^2
expand it out, then compare the coefficeitn of 2u

or just by guesing, the answer is 1

[willow coral]

How do you arrive at 1 tho???

@prime path

[prime path]

try expanding (u+1)^2

its u^2 + 2u + 1

[willow coral]

I'm so confused rn

[prime path]

what part

well try to do trial and error

[willow coral]

I'm confused abt everything like the whole question itself

[prime path]

perfect square quadractic means something this (a+b)^2

while non perfect square are like this (x+a)x+b)

so u have the form (u+a)^2

so if u expand it out it will give u^2 + 2ua + a^2

[willow coral]

How did you go from a+b to u+a

[prime path]

just notations

in tgat question

its written u

its just variables dont worry

now 2u(1) = 2u

in that question its u^2 + 2u + box

so put 1 instead of a

[willow coral]

Is it because 1 is a perfect square

[prime path]

no
its because 2 * u *1 = 2u
if u put any number other than 1, like 2 *u(2) it will give 4u, which is not in the question

choose a number which will give out 2u

[willow coral]

Ohh so 1 would be the only option

[prime path]

yes

[willow coral]

Okay thanks! Would help me with another question

[prime path]

yes np

[willow coral]

Thx!

[prime path]

it should meet
LHS = RHS

the last number whoch
16 = 16.1 when x = 4.25

is the answer

[willow coral]

so x is 4.25?

[prime path]

round it to nearest 10th

[willow coral]

So 4.3?

@prime path

[prime path]

yes

[willow coral]

Okay thank you

[prime path]

np

[supple canyon]

.solved