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Answer:
see below
Step-by-step explanation:
whenever there is negative number being squared, you need to add the brackets so that you inside the - 1 in front of the number
so this step is wrong
the -9 ² , you must include the brackets to include the -1 in front of the 9
so it should be
so you will get = 1
and then you continue with other parts of the formula and you will get real solutions
hope this helps
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Since you're only interested in x, you can use the first equation to write an expression for y that can be substituted into the second equation.
.. y = k -x
.. 2x +3(k -x) = k +1
.. -x +3k = k +1 . . . . . collect terms
.. 2k -1 -x = 0 . . . . . . subtract k+1
.. 2k -1 = x . . . . . . . . .add x
The 3rd selection is appropriate.
Completely factored it is (12x^2 + 4)(x-5)