Mathematics
KaneshaDutka74
11

if 3x-1=11,what is the value of x^2+x

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(1) Answers
amimegustalostacos

We can set the 2nd equation to y that way we have something to solve for [latex] \left \{ {{3x-1=11} \atop {x^2+x=y}} \right. [/latex] First we solve our first equation by moving the one to the other side [latex]3x=12[/latex] Then we divide by 3 on each side [latex]x=4[/latex] So now we can plug 4 into the x's of the 2nd equation [latex]4^2+4=y\\ 16+4=y\\ 20=y[/latex]

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