Question

How can u keep simplifying an expression if they have nothing left in common. I'm asked to simplify 5n^2+21n-4

Answer 1

Do you know a quadratic eqn like px^2 + qx + r =0 can be expressed in the form
px^2 - (a+b)x + ab = 0 ?
Where, a and b are the roots of the eqn, i.e. this quadratic eqn will also represent (x-a)(x-b) =0

Answer 2

I might not be very clear, please tell me if that is the case.

Answer 3

you can't simplify this expression.

\(\Large\color{orangered}{ \bf (21)^2-4(5)(-4) }\)
\(\Large\color{orangered}{ \bf 441-4(5)(-4) }\)
\(\Large\color{orangered}{ \bf 441+80 }\)
\(\Large\color{orangered}{ \bf 521 }\)

\(\Large\color{red}{ \bf 484=(±22)^2 }\) \(\Large\color{red}{ \bf 529=(±23)^2 }\)

the discriminant is not a perfect square so you can't (simply) factor this either.

Answer 4

Oh right, I didn't notice.
Can you please check the question ? Is it +4 ?

Answer 5

yeah, with +4 it would be easier :)

Answer 6

how do u type in red

Answer 7

I will message you.

Answer 8

ok

Answer 9

Try to put something up

Answer 10

\(\Large\color{purple}{ \bf H }\)\(\Large\color{blue}{ \bf e }\)\(\Large\color{royalblue}{ \bf l }\)\(\Large\color{green}{ \bf l }\)\(\Large\color{red}{ \bf o }\)\(\Large\color{orangered}{ \bf ! }\)

Answer 11

\(\Large\color{red}{ hello }\)

Answer 12

\(\Huge\color{red}{ HELLO }\)

Answer 13

yes, you can use a couple fonts and sizes in front of the phrase in LaTeX.

Sizes
\tiny
\scriptsize
\small
\normalsize
\large
\Large
\LARGE
\huge
\Huge

\(\Large\color{orangered}{ \bf ! }\)


fonts

\tt
\it
\bf
\rm
\cal
\scr
\frak

Answer 14

Thank you so much !

Answer 15

Anytime