OpenStudy (anonymous):

solve the simultaneous equation x+y=2 and x(square)+2y(square)=11

6 years ago
OpenStudy (anonymous):

guys please aswer mee

6 years ago
OpenStudy (anonymous):

from first equation y=2-x put this in the second \[x^2+2(2-x)^2=11\]this is a quadratic for x

6 years ago
OpenStudy (anonymous):

and so wuts the final ans?

6 years ago
OpenStudy (callisto):

@sarah_98 What have you got when you solve the quadratic equation in x?

6 years ago
OpenStudy (anonymous):

i ddnt solve it

6 years ago
OpenStudy (anonymous):

i need someone to solve the whole thing show me the steps and give the final answer

6 years ago
OpenStudy (callisto):

Why don't you try to do it first? Do you know how to solve quadratic equations? By the way, we are supposed to guide you to reach the answer yourself, not giving you all the steps and final answer to your question.

6 years ago
OpenStudy (anonymous):

ya i noe how to factorise

6 years ago
OpenStudy (anonymous):

but im rly bad at it

6 years ago
OpenStudy (callisto):

Have you learnt quadratic formula?

6 years ago
OpenStudy (anonymous):

yes -b+- square root of b square minus 4ac divided by 2a

6 years ago
OpenStudy (callisto):

Right.. Now consider the equation \(x^2 + 2(2-x)^2 = 11\) Expand the second term first, what have you got?

6 years ago
OpenStudy (anonymous):

I solved it and this what ve got 1.72 or 0.387.to get the above answer you wil have to make x the subject of d formula and subtitute x in equation 2' then expand,u wil get a quadratic equation then solve it to get d final result.

6 years ago